 But it is known have developmental effects appear in fetuses and children even at very small doses.It has been shown to cause abnormal reflexes in neonates, poorer mental development in 2 and 3 year olds, poorer verbal IQ in and 5 year old and pervasive developmental disorder in 2, 3 and year olds.Endocrine disruptors are molecules that alter the structure or function of the endocrine system like DDT, BPA etc.