At a scientific conference in November, Dr. Lester presented an analysis of a pool of studies of 14 groups of cocaine-exposed children — 4,419 in all, ranging in age from 4 to 13. The analysis failed to show a statistically significant effect on I.Q. or language development. In the largest of the studies, I.Q. scores of exposed children averaged about 4 points lower at age 7 than those of unexposed children.
Cocaine is undoubtedly bad for the fetus. But experts say its effects are less severe than those of alcohol and are comparable to those of tobacco — two legal substances that are used much more often by pregnant women, despite health warnings.
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