Sleepiness and sedative effect in a child have been reported. In a group of mothers who were taking 200 mg daily, their breastfed infants have failed to show any untoward effect. Three infants, whose mothers were on haloperidol and chlorpromazine at the same time, have shown a lower scoring at developmental test between 12 and 18 months. Breast milk production may become increased by stimulation of prolactin release.