 Use of stimulants like methamphetamine and cocaine during pregnancy are linked to a number of problems for the child such as low birth weight and small head circumference and motor and cognitive developmental delays, as well as behavioral problems across childhood.The American Academy of Child and Adolescent Psychiatry found that 6 year-olds whose mothers had smoked during pregnancy scored lower on an intelligence test than children whose mothers had not.Cigarette smoking during pregnancy can have a multitude of detrimental effects on the health and development of the offspring.