The visual fixation of two groups of healthy newborn infants was tested at a mean age of three days. Mothers of the infants in one group received a single dose of meperidine (pethidine) during labour and delivery; those in the second group received no medication. Unlike infants of mothers who received a single dose of alphaprodine hydrochloride in a previous study, there were no differences between the groups in the present study. Moreover, longer drug-to-delivery intervals did not appear to potentiate the effects of meperidine. A single dose of meperidine appears to have few effects on neonates' sensory functioning, which is contrary to other reports.
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