kyliemom - We started DS on the playtex ventaire bottles first also, ours leaked from the bottom though. If you are using the blue tinted nipples, I don't recommend poking another hole. The packaging warns against it because it may rip while feeding and lodge in baby's throat posing a choking hazard. We switched to Avent and these leak from the neck if you don't get the tops on just right, but I wasn't spending any more $$$ on bottles, so we have used them since and I just test them over the sink before feeding.