Don't these attitudes sound familiar? A parent reported to me recently that he was encouraged to let his baby cry herself to sleep so he "could get his life back."
[Note: In other posts on infant sleep listed below, my co-authors and I point out flaws in studies of sleep training. Here is another example. Check out this article and its table that lists the studies reviewed. The table shows that every study is flawed--either the intervention was not followed (fidelity) and/or only parent reports were used, not observation. Moreover, the age range of the children varied. Most importantly, note that most studies did not measure child wellbeing. So there is no responsible way to draw generalizable conclusions from this set of flawed studies. The standards for publishing such studies appears to be very low. In a forthcoming post, we note how many studies use an "Intent to Treat" criterion for distinguishing conditions, not bothering about what actually happened.]
With neuroscience, we can confirm what our ancestors took for granted---that letting babies get distressed is a practice that can damage children and their relational capacities in many ways for the long term. We know now that leaving babies to cry is a good way to make a less intelligent, less healthy but more anxious, uncooperative and alienated persons who can pass the same or worse traits on to the next generation.
The discredited behaviorist view sees the baby as an interloper into the life of the parents, an intrusion who must be controlled by various means so the adults can live their lives without too much bother. Perhaps we can excuse this attitude and ignorance because at the time, extended families were being broken up and new parents had to figure out how to deal with babies on their own, an unnatural condition for humanity--we have heretofore raised children in extended families. The parents always shared care with multiple adult relatives.
According to a behaviorist view completely ignorant of human development, the child 'has to be taught to be independent.' We can confirm now that forcing "independence" on a baby leads to greater dependence. Instead, giving babies what they need leads to greater independence later. In anthropological reports of small-band hunter-gatherers, parents took care of every need of babies and young children. Toddlers felt confident enough (and so did their parents) to walk into the bush on their own (see Hunter-Gatherer Childhoods, edited by Hewlett & Lamb, 2005).
Ignorant behaviorists then and now encourage parents to condition the baby to expect needs NOT to be met on demand, whether feeding or comforting. It's assumed that the adults should 'be in charge' of the relationship. Certainly this might foster a child that doesn't ask for as much help and attention (potentially withdrawing into depression and going into stasis or even wasting away) but it is more likely to foster a whiney, unhappy, aggressive and/or demanding child, one who has learned that one must scream to get needs met. A deep sense of insecurity is likely to stay with them the rest of life.
The fact is that caregivers who habitually respond to the needs of the baby before the baby gets distressed, preventing crying, are more likely to have children who are independent than the opposite (e.g., Stein & Newcomb, 1994). Soothing care is best from the outset. Once patterns of distress get established, it's much harder to change them.
Rats are often used to study how mammalian brains work and many effects are similar in human brains. In studies of rats with high or low nurturing mothers, there is a critical period for turning on genes that control anxiety for the rest of life. If in the first 10 days of life you have a low nurturing rat mother (the equivalent of the first 6 months of life in a human), the gene never gets turned on and the rat is anxious towards new situations for the rest of its life, unless drugs are administered to alleviate the anxiety. These researchers say that there are hundreds of genes affected by nurturance. Similar mechanisms are found in human brains--caregiver behavior matters for turning genes on and off. (See work of Michael Meaney and colleagues; e. g., Meaney, 2001).
We should understand the mother and child as a mutually responsive dyad. They are a symbiotic unit that make each other healthier and happier in mutual responsiveness. This expands to other caregivers too.
One strangely popular notion still around today is to let babies 'cry it out' (aka total extinction or unmodified extinction) when they are left alone, isolated in cribs or in other devices. This comes from a misunderstanding of child brain development.
- Babies grow from being held. Their bodies get dysregulated when they are physically separated from caregivers. (See here for more.)
- Babies indicate a need through gesture and eventually, if necessary, through crying. Just as adults reach for liquid when thirsty, children search for what they need in the moment. Just as adults become calm once the need is met, so do babies.
- There are many longterm effects of undercare or need-neglect in babies (e.g., Bremmer et al, 1998; Blunt Bugental et al., 2003; Dawson et al., 2000; Heim et al 2003).
What does 'crying it out' actually do to the baby and to the dyad?
Neuronal interconnections are damaged. When the baby is greatly distressed,it creates conditions for damge to synapses, the network construction which is ongoing in the infant brain. The hormone cortisol is released. In excess, it's a neuron killer but its consequences many not be apparent immediately (Thomas et al. 2007). A full-term baby (40-42 weeks), with only 25% of its brain developed, is undergoing rapid brain growth. The brain grows on average three times as large by the end of the first year (and head size growth in the first year is a sign of intelligence, e.g., Gale et al., 2006). Who knows what neurons are not being connected or being wiped out during times of extreme stress? What deficits might show up years later from such regular distressful experience? (See my addendum below.)
Disordered stress reactivity can be established as a pattern for life not only in the brain with the stress response system (Bremmer et al, 1998), but also in the body through the vagus nerve, a nerve that affects functioning in multiple systems (e.g., digestion). For example, prolonged distress in early life, lack of responsive parenting, can result in a poorly functioning vagus nerve, which is related to various disorders as irritable bowel syndrome (Stam et al, 1997). See more about how early stress is toxic for lifelong health from the recent Harvard report, The Foundations of Lifelong Health are Built in Early Childhood).
Self-regulation is undermined. The baby is absolutely dependent on caregivers for learning how to self-regulate. Responsive care---meeting the baby's needs before he gets distressed---tunes the body and brain up for calmness. When a baby gets scared and a parent holds and comforts him, the baby builds expectations for soothing, which get integrated into the ability to self comfort. Babies don't self-comfort in isolation. If they are left to cry alone, they learn to shut down in face of extensive distress--stop growing, stop feeling, stop trusting (Henry & Wang, 1998).
Trust is undermined. As Erik Erikson pointed out, the first year of life is a sensitive period for establishing a sense of trust in the world, the world of caregiver and the world of self. When a baby's needs are met without distress, the child learns that the world is a trustworthy place, that relationships are supportive, and that the self is a positive entity that can get its needs met. When a baby's needs are dismissed or ignored, the child develops a sense of mistrust of relationships and the world. And self-confidence is undermined. The child may spend a lifetime trying to fill the resulting inner emptiness.
Caregiver sensitivity may be harmed. A caregiver who learns to ignore baby crying, will likely learn to ignore the more subtle signaling of the child's needs. Second-guessing intuitions that guide one to want to stop child distress, the adult who learns to ignores baby needs practices and increasingly learns to "harden the heart." The reciprocity between caregiver and baby is broken by the adult, but cannot be repaired by the young child. The baby is helpless.
Caregiver responsiveness to the needs of the baby is related to most if not all positive child outcomes. In our work caregiver responsiveness is related to intelligence, empathy, lack of aggression or depression, self-regulation, social competence. Because responsiveness is so powerful, we have to control for it in our studies of other parenting practices and child outcomes. The importance of caregiver responsiveness is common knowledge in developmental psychology. Lack of responsiveness, which "crying it out" represents can result in the opposite of the aforementioned positive outcomes.
The 'cry it out' approach seems to have arisen as a solution to the dissolution of extended family life in the 20th century. The vast knowledge of (now great great) grandmothers was lost in the distance between households with children and those with the experience and expertise about how to raise them well. The wisdom of keeping babies happy was lost between generations.
But isn't it normal for babies to cry?
No. A crying baby in our ancestral environment would have signaled predators to tasty morsels. So our evolved parenting practices alleviated baby distress and precluded crying except in emergencies. Babies are built to expect the equivalent of an "external womb" after birth (see Allan Schore, specific references below). What is the external womb? ---being held constantly, breastfed on demand, needs met quickly (I have numerous posts on these things). These practices are known to facilitate good brain and body development (discussed with references in other posts, some links below). When babies display discomfort, it signals that a need is not getting met, a need of their rapidly growing systems.
What does extensive baby crying signal? It shows the lack of experience, knowledge and/or support of the baby's caregivers. To remedy a lack of information in us all, below is a good set of articles about all the things that a baby's cry can signal. We can all educate ourselves about what babies need and the practices that alleviate baby crying. We can help one another to keep crying from happening as much as possible.
Check these out:
How to soothe babies: http://www.babycenter.com/0_12-reasons-babies-cry-and-how-to-soothe-them_9790.bc?page=2
Soothing babies crying "for no reason": http://www.babycenter.com/0_what-to-do-when-your-baby-cries-for-no-reason_10320516.bc
Soothing babies who have "colic": http://www.babycenter.com/0_colic-how-to-cope_1369745.bc
Science of Parenting, an inexpensive, photo-filled, easy-to-read book for parents by Margot Sunderland, has much more detail and references on these matters. I keep copies on hand to give to new parents.
Here is a terrific post on co-sleeping (the abandoned practice that is behind notions of leaving babies to cry it out) by my esteemed colleague, Peter Gray. Much more about co-sleeping research is here at the website of my colleague, James McKenna.
More on babies' and children's needs here, here, here.
Giving babies what they need is really a basic right of babies. See here for more rights I think babies should expect. And see here for a new book by Eileen Johnson on the emotional rights of babies.
ADDENDUM: I was raised in a middle-class family with a depressed mother, harsh father and overall emotionally unsupportive environment--not unlike others raised in the USA. I have only recently realized from extensive reading about the effects of early parenting on body and brain development that I show the signs of undercare--poor memory (cortisol released during distress harms hippocampus development), irritable bowel and other poor vagal tone issues, and high social anxiety. The USA has epidemics of poor physical and mental health (e.g., UNICEF, 2007; USDHSS, 1999; WHO/WONCA, 2008). The connection between the lack of ancestral parenting practices and poor health outcomes has been documented for touch, responsiveness, breastfeeding, and more (Narvaez et al., in press). If we want a strong country and people, we've got to pay attention to what children need for optimal development.
POSTS ON PARENTING ISSUES AND CHILD DEVELOPMENT:
Links to other posts on infant sleep and sleep training:
6 Hidden Myths Behind Baby Sleep Training Advocacy
Child Sleep Training’s “Best Review of Research”
Parents Misled by Cry-It-Out Sleep Training Reports
REBUTTAL to critique of "Parents Misled by...Sleep Training Reports"
Dangers of "Crying it Out"
Baby Sleep Training: Mistakes “Experts” and Parents Make
'Let Crying Babes Lie'? So Wrong
Simple Ways to Calm a Crying Baby
Normal, Human Infant Sleep: Feeding Method and Development
Normal Infant Sleep: Changing Patterns
Normal Parent Behaviors and Why They Won’t Hurt Your Child
Normal Infant Sleep: Night Nursing's Importance
More Normal Parenting for Sleep
Understanding and Helping Toddler Sleep
Understanding and Helping Toddler Sleep-Tiredness?
Understanding and Helping Toddler Sleep--Preparing Success
SIDS: Risks and Realities
Bed Sharing With Babies: What is the Hype About?
Bedsharing or Co-Sleeping Can Save Babies' Lives
New Moms Need Social Support
Painkillers for Childbirth? The Few Pros and Many Cons
What's the Use of Midwives and Doulas?
Jesus Had a Home Birth
What if Jesus Had Been Born in the USA?
Why Continue to Harm Boys from Ignorance of Male Anatomy?
What Is the Greatest Danger for an Uncircumcised Boy?
Circumcision Ethics and Economics
Circumcision: Social, Sexual, Psychological Realities
More Circumcision Myths You May Believe: Hygiene and STDs
Myths about Circumcision You Likely Believe
Stand Up For Breastfeeding
Talk About Breastfeeding With Your Family, Friends and Doctor
Breastmilk Wipes Out Formula: Responses to Critical Comments
In Light of Last Week's Posts: Is Pushing* Formula Evil?
The REAL Truth about Breastfeeding
5 Things You Thought You Knew about Breastfeeding
The TREMENDOUS Benefits of Doing What is Normal: Breastfeeding
Myths you probably believe about infant formula
Your assumptions about infant formula are probably wrong
It’s Breastfeeding Week: Why should you care?
Research on Spanking: It's Bad for ALL Kids
What Happened to Ethics in Pediatric Medicine?
Baby-, Parent- or Life-Centered Parenting?
Ten Ways to Truly Respect Motherhood
Slings and Heroes
Parents Should Know the Limitations of Science Experiments
Babies "don’t cry in Africa," why should they cry in the USA?
Blame the baby or blame the experts?
Dumb Parent(ing), Dumberer Child
How to Grow a Smart Baby
Are you treating your child like a prisoner?
Undercare: The bane of American life?
Promoting Thriving in School-Aged Children: A Checklist
Is it good to make kids afraid?
How NOT to Ruin a Child
Are you or your child on a (touch) starvation diet?
Mother’s touch of dead baby causes “miracle”
What Does Good Parenting Look Like? You Decide.
Are You a “Childist?" Test Yourself
Babies Are Needy—Does That Bug You?
Do We Need Declaration for the Rights of the Baby?
Where Are the Happy Babies?
The Decline of Children and the Moral Sense
Believing "children are resilient" may be a fantasy
How America Morally Fails its Children: What Needs to Change
Increase the well-being of children around you
NOTE on BASIC ASSUMPTIONS: When I write about parenting, I assume the importance of the evolved developmental niche (EDN) for raising human infants (which initially arose over 30 million years ago with the emergence of the social mammals and has been slightly altered among human groups based on anthropological research).
The EDN is the baseline I use for determining what fosters optimal human health, wellbeing and compassionate morality. The niche includes at least the following: infant-initiated breastfeeding for several years, nearly constant touch, responsiveness to needs so the young child does not get distressed, playful companionship, multiple adult caregivers, positive social support, and natural childbirth.
All these characteristics are linked to health in mammalian and human studies (see Narvaez, Panksepp, Schore & Gleason, 2013, for a review.) Thus, shifts away from the EDN baseline are risky. My comments and posts stem from these basic assumptions.
Blum, D. (2002). Love at Goon Park: Harry Harlow and the Science of Affection. New York: Berkeley Publishing (Penguin).
Blunt Bugental, D. et al. (2003). The hormonal costs of subtle forms of infant maltreatment. Hormones and Behaviour, January, 237-244.
Bremmer, J.D. et al. (1998). The effects of stress on memory and the hippocampus throughout the life cycle: Implications for childhood development and aging. Developmental Psychology, 10, 871-885.
Dawson, G., et al. (2000). The role of early experience in shaping behavioral and brain development and its implications for social policy. Development and Psychopathology, 12(4), 695-712.
Catharine R. Gale, PhD, Finbar J. O'Callaghan, PhD, Maria Bredow, MBChB, Christopher N. Martyn, DPhil and the Avon Longitudinal Study of Parents and Children Study Team (October 4, 2006). "The Influence of Head Growth in Fetal Life, Infancy, and Childhood on Intelligence at the Ages of 4 and 8 Years". PEDIATRICS Vol. 118 No. 4 October 2006, pp. 1486-1492. http://pediatrics.aappublications.org/cgi/content/short/118/4/1486.
Heim, C. et al. (1997). Persistent changes in corticotrophin-releasing factor systems due to early life stress: Relationship to the pathophysiology of major depression ad post-traumatic stress disorder. Psychopharmacology Bulletin, 185-192.
Henry, J.P., & Wang, S. (1998). Effects of early stress on adult affiliative behavior, Psychoneuroendocrinology 23( 8), 863-875.
Hewlett, B., & Lamb, M. (2005). Hunter-gatherer childhoods.New York: Aldine.
Meaney, M.J. (2001). Maternal care, gene expression, and the transmission of individual differences in stress reactivity across generations. Annual Review of Neuroscience, 24, 1161-1192.
Narvaez, D., Panksepp, J., Schore, A., & Gleason, T. (Eds.) (in press). Evolution, Early Experience and Human Development: From Research to Practice and Policy. New York: Oxford University Press.
Panksepp, J. (1998). Affective neuroscience. New York: Oxford University Press.
Schore, A.N. (1997). Early organization of the nonlinear right brain and development of a predisposition to psychiatric disorders. Development and Psychopathology, 9, 595-631.
Schore, A.N. (2000). Attachment and the regulation of the right brain. Attachment & Human Development, 2, 23-47.
Schore, A.N. (2001). The effects of early relational trauma on right brain development, affect regulation, and infant mental health. Infant Mental Health Journal, 22, 201-269.
Stam, R., et al. (1997). Trauma and the gut: Interactions between stressful experience and intestinal function. Gut.
Stein, J. A., & Newcomb, M. D. (1994). Children's internalizing and externalizing behaviors and maternal health problems. Journal of Pediatric Psychology, 19(5), 571-593.
Thomas, R.M., Hotsenpiller,G. & Peterson, D.A. (2007).Acute Psychosocial Stress Reduces Cell Survival in Adult Hippocampal Neurogenesis without Altering Proliferation. The Journal of Neuroscience, 27(11): 2734-2743.
UNICEF (2007). Child poverty in perspective: An overview of child well-being in rich countries, a comprehensive assessment of the lives and well-being of children and adolescents in the economically advanced nations, Report Card 7. Florence, Italy: United Nations Children's Fund Innocenti Research Centre.
U.S. Department of Health and Human Services, Substance Abuse and Mental Health Services Administration. (1999). Mental health: A report of the Surgeon General. Rockville, MD: Center for Mental Health Services, National Institutes of Health, National Institute of Mental Health.
Watson, J. B. (1928). Psychological Care of Infant and Child. New York: W. W. Norton Company, Inc.
WHO/WONCA (2008). Integrating mental health into primary care: A global perspective. Geneva and London: World Health Organization and World Organization of Family Doctors.
NOTE on BASIC ASSUMPTIONS:
When I write about parenting, I assume the importance of the evolved developmental niche (EDN) for raising human infants (which initially arose over 30 million years ago with the emergence of the social mammals and has been slightly altered among human groups based on anthropological research).
The EDN is the baseline I use for determining what fosters optimal human health, wellbeing and compassionate morality. The niche includes at least the following: infant-initiated breastfeeding for several years, nearly constant touch early, responsiveness to needs so the young child does not get distressed, playful companionship with multi-aged playmates, multiple adult caregivers, positive social support, and soothing perinatal experiences.
All these characteristics are linked to health in mammalian and human studies (for reviews, see Narvaez, Panksepp, Schore & Gleason, 2013; Narvaez, Valentino, Fuentes, McKenna & Gray, 2014; Narvaez, 2014) Thus, shifts away from the EDN baseline are risky. My comments and posts stem from these basic assumptions.