Hi, Thanks for posting in HCM. I understand your concern. Cephalexin is an antibiotic, which is acceptable to be used during breastfeeding. Limited information indicates that intake of maternal doses of cephalexin up to 1 gram shows low concentration in breast milk, that is not expected to cause any ill effects in breastfed infants. Data on excretion of diclofenac into milk is limited. Considering Diclofenac has a short half-life and little glucuronide metabolite formation, many reviewers consider diclofenac to be acceptable during breastfeeding. Hence, you can continue to feed the baby while on these prescribed medications. Hope the information provided would be helpful. All the best.