The amount of development our body system provides for us the moment the sperm and egg cell meet is amazing. Embryos become small fetus' while the mother plays a major role of a childs development even during the prenatal stage. Life consist of so much work to develop properly- sex chromosomes take place, genotypes and phenotypes are formed, and unfortunately abnormalties can occur. "Impaired functioning of the placental proteins that support the function of neurons may increase the risk of developing obesity, diabetes, and/or neurological problems later in life" (p. 78). Gene-linked abnormalities are what defects specific genes, chromosomal "occur as either numerical abnormalities of chromosomes or structural abnormalities of chromosomes" (p. 54), congenital is defects at birth, and hereditary disorders are usually linked to our ancestors. Some resources for healthy development that can be used are

A.A.P. (2005). Promoting Healthy Development. Bright Futures. https://brightfutures.aap.org/Bright%20Futures%20Documents/BF4_HealthyDevelopment.pdf

Or 

Moretti, M. M., & Peled, M. (2004). Adolescent-parent attachment: Bonds that support healthy development. Paediatrics & Child Health, 9(8), 551–555. https://doi.org/10.1093/pch/9.8.551

Or 

Anthis, K. (2020). Our Genes and Our Environment. In Adolescent Development (1st ed., pp. 54–78). Cognella Academic Publishing.