For Debate: Does Cannabis Use by the Pregnant Mother Affect the Foetus and Newborn?

Marijuana does not appear to be a major teratogen; however, a small increased risk for some congenital birth defects may be associated with early pregnancy use. Neurodevelopmental effects have been associated with marijuana use, but it is difficult to control for the effect of confounders. Despite the lack of conclusive evidence, it is important to remember that marijuana has not been shown to be a harmless drug during pregnancy and may affect the long-term neurodevelopment of the newborn infant