Background: The effects of in utero exposure to atypical antipsychotics on infant birth weight are unknown.

Aims: To determine whether atypical and typical antipsychotics differ in their effects on birth weight after maternal exposure during pregnancy.

Method: Prospective data on gestational age and birth weight collected by the National Teratology Information Service for infants exposed to typical (n=45) and atypical (n=25) antipsychotics was compared with data for a reference group of infants (n=38).

Results: Infants exposed to atypical antipsychotics had a significantly higher incidence of large for gestational age (LGA) than both comparison groups and a mean birth weight significantly heavier than those exposed to typical antipsychotics. In contrast those exposed to typical antipsychotics had a significantly lower mean birth weight and a higher incidence of small for gestational age infants than the reference group.

Conclusions: In utero exposure to atypical antipsychotic drugs may increase infant birth weight and risk of LGA.

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http://dx.doi.org/10.1192/bjp.bp.107.041541DOI Listing

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