The National Institutes of Health (NIH) notes that research has shown that some babies born to women who abused marijuana during their pregnancies display altered responses to visual stimuli, increased tremulousness (trembling or shaking), and a high-pitched cry -- any of which may indicate neurological problems in development. During the preschool years, marijuana-exposed children have been observed to perform tasks involving sustained attention and memory more poorly than nonexposed kids do. Then, in the school years, these kids of pot smokers are more likely to exhibit deficits in problem-solving skills, memory and the ability to remain attentive.