Oxazepam is a metabolite of diazepam with a short elimination period. At the doses usually used, reaches a concentration in the milk relatively lower than other benzodiazepines, so that, probably has a low potential to cause adverse effects on the baby. There are no reported cases of pernicious influence of oxazepam in the breastfed infant. Of the few studies available, it appears that the baby may ingest an amount less than 1% of the dose given to the mother.
Warning of the manufacturer:
Since benzodiazepines are found in the breast milk, benzodiazepines should not be given to breast feeding mothers.