Patient: description of illness (onset, main symptoms, hospitalization, etc.): I used Trimethoprim Cream (this product contains 10 mg of miconazole nitrate, 1 mg of trimethoprim acetate, and 3,000 units of neomycin sulfate per gram) due to foot `while breastfeeding and I wonder if it will have any effect on the baby? (Used when baby was 3.5 months old. There is no abnormality so far) I have used trimethoprim cream before without baby, and it had some effect on foot`s, and it has come back again while breastfeeding, so I used this medicine. 1) I would like to know if using this medicine in this case has any effect on the baby? 2) Is it necessary to examine the baby? Obstetrician and gynecologist: Trimethoprim is a hormone, miconazole cream, and is contraindicated in pregnant and breastfeeding women. However, for topical use, very little is absorbed by the mother’s body and even less is secreted through breast milk, so the effect on the baby is minimal and you don’t need to worry.