Research shows that head size growth in the first year of life relates to intelligence later (Gale et al., 2006). It doesn't matter how large the baby's head was at birth, it's what happens in the first year after birth that matters most.

How do babies grow after birth?

DNA synthesis occurs rapidly following conception and through the first years of life. Nerve growth factor is a hormone that facilitates development. Both are promoted by TOUCH.

When mothers stop touching their infants, DNA synthesis stops, growth hormone diminishes (Schaunberg, 1995). Physiologically, the baby goes into "survival mode."

Our ancestors carried and held (all the time) and slept with their babies, maximizing growth.

What else helps the baby grow?

Breastmilk. Use of infant formula is risky. It is greatly inferior to breastmilk in so many ways (I'll put this in a later blog). It  linked to poor development of brain neurotransmitters and of the immune system which influence how the brain functions. Formula feeding is a risk factor for all sorts of diseases, large and small, including diabetes.

Breastfeeding encourages right brain development, the source of social emotions and practical intelligence. Breast milk fosters more efficient function=more intelligence.

Even adopting moms can breastfeed!

What deters growth?

Distress. Crying kills neuronal connections.When the stress-response system kicks in, goodbye synapses. But the "other brain" is also affected.  Too much stress suppresses glial cell division--and glial cells take care of myelinization at developmental plateaus (myelin is the capstone for a neuron and facilitates communication with other neurons).

It is advisable for a parent to be like an ancient traditionalist---anticipate the baby's needs by its movements, its restlessness. Don't let it get upset before  tending to its needs. Figure out the specific holding and rocking patterns that it prefers and that calm it down.

(Traditional caregivers are even able to anticipate elimination in their babies when they carry them around, circumventing the need for diapers. Of course, most of the time we cannot follow this practice in the modern world!)

It's not surprising that these parenting principles have been around for 30 million years among catarrhine mammals (of which we are a part). These practices are shown to bring about intelligence by fostering a well-functioning body and brain.

Take home message: If you want a smart baby...

1, (Almost) NEVER PUT IT DOWN!

2, Keep it CALM.

3. Feed it MOTHER's milk. Plan and work to breastfeed for at least a year if not longer (ancestral patterns were 2-5 years with an average weaning age of 4; Hewlett & Lamb, 2005).

POSTS ON PARENTING ISSUES AND CHILD DEVELOPMENT:

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

BIRTH

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?

CIRCUMCISION

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

BREASTFEEDING

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?

Breastfeeding Resources

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?

PARENTING: GENERAL

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.

CHILDREN’S RIGHTS

Childism Revisited

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

SERIES ON CHILD FLOURISHING*

1. Kindness in Kids and the Nature-Nurture Debate (Dr. Sarina Saturn)

2. Why Synchronize and Bond With Your Children (Dr. Ruth Feldman)

3. “I want it—now!” How Children Learn Self-Control (Dr. Julie Braungart-Rieker)

4. Why Kids Should Be Protected from Toxic Stress (Dr. Bruce Perry)

5. “Mr. Mom” The New (or Old?) Normal (Dr. Lee Gettler)

6. Why Dad’s “Talk” is Important (Dr. Holly Brophy-Herb)

7. Conflict in the Family: Why Mom and Dad Should Say “Sorry” (Dr. Mark Cummings)

8. Domination or Partnership? How Does Your Family Stack Up? (Dr. Riane Eisler)

9. Why Carefully Invest Daily in a Child (Dr. Robin Nelson)

*Posts are based on talks presented at the Pathways to Child Flourishing conference, University of Notre Dame, Notre Dame, IN.

ALSO SEE: What is Child Flourishing?

NOTE on BASIC ASSUMPTIONS:

When I write about human nature, I use the 99% of human genus history as a baseline. That is the context of small-band hunter-gatherers. These are “immediate-return” societies with few possessions who migrate and forage. They have no hierarchy or coercion and value generosity and sharing. They exhibit both high autonomy and high commitment to the group. They have high social wellbeing. See comparison between dominant Western culture and this evolved heritage in my article (you can download from my website):

Narvaez, D. (2013). The 99 Percent—Development and socialization within an evolutionary context: Growing up to become “A good and useful human being.” In D. Fry (Ed.), War, Peace and Human Nature: The convergence of Evolutionary and Cultural Views (pp. 643-672).  New York: Oxford University Press.

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 EDN 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 and must be supported with longitudinal data looking at wellbeing in children and adults. My comments and posts stem from these basic assumptions.

My research laboratory has documented the importance of the EDN for child wellbeing and moral development with more papers in the works see (my Website to download papers):

Narvaez, D., Gleason, T., Wang, L., Brooks, J., Lefever, J., Cheng, A., & Centers for the Prevention of Child Neglect (2013). The Evolved Development Niche: Longitudinal Effects of Caregiving Practices on Early Childhood Psychosocial Development. Early Childhood Research Quarterly, 28 (4), 759–773. Doi: 10.1016/j.ecresq.2013.07.003

Narvaez, D., Wang, L., Gleason, T., Cheng, A., Lefever, J., & Deng, L.  (2013). The Evolved Developmental Niche and sociomoral outcomes in Chinese three-year-olds. European Journal of Developmental Psychology, 10(2), 106-127.

Also see these books for selected reviews:

Evolution, Early Experience and Human Development (Oxford University Press)

Ancestral Landscapes in Human Evolution (Oxford University Press)

Neurobiology and the Development of Human Morality: Evolution, Culture and Wisdom (W.W. Norton)

REFERENCES

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.

Hewlett, B., & Lamb, M. (2005). Hunter-gatherer childhoods.New York: Aldine.

Schanberg, S. (1995). The genetic basis for touch effects. In T. Field (Ed.), Touch and Early Experience (pp. 67-80). Mahwah, NJ: Erlbaum.

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