M.A.
We used Playtex drop-ins. I tried a bunch of different bottles because my baby was 100% breastfed and didn't go to daycare until she was 7 months. She rejected most bottles, even one shaped exactly like a breast. She accepted the Playtex and she wasn't gassy from it, but she was older than an infant. We still use them (she's 3 now) and they are super convenient to travel with. No BPA and light weight.