Very Early Childhood Development

Excerpt

Developmental potential is the ability to think, learn, remember, relate, and articulate ideas appropriate to age and level of maturity, and an estimated 39 percent of the world’s children under age five years do not attain this potential (Grantham-McGregor and others 2007).

The main reason for giving prominent attention to mental development from conception through the first 24 months of life is that early unfavorable conditions can impair the normal development of the brain. The impairment is often incremental and unnoticed until schooling begins. The most striking example of impairment is the gradual deletion of unused brain synapses. The lack of use may be due to the absence of stimulation in the family environment or lack of available energy for brain activity. Regenerating those lost synapses may occur at an older age but with additional costs. For example, children who do not acquire a good vocabulary in the early years will have difficulty learning how to read; children who do not acquire simple problem-solving strategies in the first 24 months will have difficulty understanding math concepts; children who do not develop secure emotional attachments to adults will have difficulty coping with stresses and challenges throughout life. The plasticity of the brain diminishes with age, but greater plasticity in the very early years suggests that brain development has a greater chance of being modified by protective interventions than by interventions later in life (Werker and Hensch 2015).

A second reason for attending to early mental development is that individuals, communities, and societies are healthier and more productive if they have mature mental skills. More educated adults are healthier and wealthier than less educated adults. Educated mothers have healthier children and are more likely to recognize symptoms of illness, follow medical advice, feed their children nutritious foods, and keep their homes clean (Boyle and others 2006; Cleland and van Ginneken 1988). Educated husbands are less likely to condone or use violence to resolve domestic conflicts (Abraham and others 2006). Follow-up data of adults who participated in early psychosocial stimulation programs demonstrate some of these long-term benefits (Gertler and others 2014).

This chapter discusses mental development from birth to age 24 months in low- and middle-income countries (LMICs). We include recent literature published since the 2011 child development series in The Lancet. Although we focus on cognitive and language domains, we touch on socioemotional, fine motor, and gross motor development. First, a description of how these domains are measured provides an operational definition of the term mental development. Second, conditions that derail early child development are examined. These conditions arise during the prenatal period and continue throughout the next 24 months; they include psychosocial stimulation, prenatal and postnatal nutrition, the physical environment, and maternal mental health. Finally, the results of several systematic reviews and meta-analyses are presented to show the effects of stimulation and nutrition, along with disease-related interventions to promote mental development. Maternal interventions related to nutrition and mental health are also reviewed. A framework of critical components to include in programs is outlined.