Yup I did since baby was a few days old as he had to stay in hospital for a week aft birth due to jaundice and I cldnt express enough BM so hospital gave him mix BM and FM. I continued to breastfeed and bottle feed him aft that too and he has no problem with both. For me, I try to limit bottle feed only twice a day (once in the aftn and once at night) and the rest breastfeed. When he wakes up in the middle of the night, I'll breastfeed him as he falls asleep faster when latched.