Biological Factors That Influence Child Development

By Douglas Haddad Updated on August 31, 2020 Medically reviewed by Sarah Rahal, MDEarly child development is influenced by a wide variety of both biological and environmental factors. Biological factors can play a particularly important role in early development. These factors influence a child in both positive and negative ways. They can affect children throughout their development, particularly during critical times such as the prenatal period and early childhood. Research conducted at Rutgers University demonstrated that prenatal factors affect linguistic development and postnatal factors contribute to a child’s cognitive development.1 And gross motor development is widely considered to be the result of innate, biological factors, with postnatal factors contributing to a lesser extent. Biological factors include genetic influences, brain chemistry, hormone levels, nutrition, and gender. Here is a closer look at nutrition and gender and how they affect development. Nutrition Proper nutrition is a vital factor in a child’s overall development. Prior to birth, a mother’s diet and health play a key role. For example, folic acid intake of 400 micrograms (mcg) daily for three months prior to conception and during early pregnancy significantly decreases the risk of certain birth defects of a baby’s brain (anencephaly) and spine (spina bifida).2 These birth defects occur in the first few weeks of pregnancy, which is why it is important for women in their childbearing years to ensure they are getting at least 400 micrograms of folic acid daily. Waiting until a woman finds out she is pregnant can be too late. Gender Most people possess 23 pairs of chromosomes in their cells (with the exception of special reproductive cells called gametes). The first 22 pairs are called autosomes, which are the same in boys and girls. Therefore, males and females share most of the same set of genes. The 23rd pair of chromosomes is what determines the gender of an individual. Boys typically have one X chromosome and one Y chromosome while girls have two X chromosomes. Hence, gender differences at the biological level are found on the Y chromosome. Gender can influence development in a variety of ways. For example, boys tend to develop and learn differently than girls and have lower levels of school readiness.3 A child’s physical body has distinctive reproductive organs and becomes further differentiated as special sex hormones are produced that play a role in gender differences. Boys typically produce more androgens (male sex hormones), while females produce estrogens (female sex hormones). Scientists have studied the effect of excessive amounts of sex hormones on a child’s behavior. They have found that boys with higher than normal androgen levels play and behave similarly to their male peers with normal androgen levels. However, girls with high androgen levels typically exhibit more gender-stereotypic male traits than do girls who have normal androgen levels.4 Interactions Among Biological and Environmental Factors It is important to remember that biological factors do not act in isolation. Genes, for example, can interact both with other genes and the environment. Some genes may dominate and prevent others from being expressed. In other cases, certain biological influences might impact genetic expression.