P.R.
I just bought the same bottle for my 4 month old b/c she is used to breastfeeding, and I'm trying to wean her to taking more of the bottle now that she is starting daycare. I, too, am experiencing the same problem. No matter how tight I put the cap, the bottle leaks. I guess its the bottle itself. I've tried 'Breast Flow' bottle from My First Years. It's a ver good bottle b/c it resembles an actual breast nipple.