The study assessed the IQ of 121 Canadian children between the ages of 3 and 7, whose mothers had suffered morning sickness. They found that the kids scored high on certain tests of IQ, memory and language skills.
Furthermore use of morning sickness medicine diclectin did not reduce these effects. The study suggests that "nausea and vomiting in pregnancy is not harmful and in fact may enhance favorably children's long-term"
Researchers said that it may be possible that some pregnancy hormones linked to morning sickness may also influence fetal brain development. The details of the study are published in the Journal of Pediatrics.