It has been observed that more maternal medications and illicit use of drugs by pregnant women and lactating mothers have untoward effect on normal development of foetus and infants. These agents include prescribed drugs, alcohol, heroin, L. S.D., barbiturates and even artificial food colours and flavours and various types of lactose, fructose & galactose. These interfere with normal enzyme activities. D.D. T. and lead are the two most important atmospheric pollutants and major sources of brain damage, mental deficiency and serious behaviour problems.