Leaking bottle

<p>I bought Dr Brown's bottles when my baby was 1 month old and after a 1 month the bottle started to leak of milk when feeding him. This became very frustrating because knowing Dr Brown's are known to be the best. I then sent a complaint email when my baby was 3 months old and they sent me two new internal vent system. My baby is now 4 months old and I am experiencing the same thing again. These bottles are not cheap and it's frustrating because it's been twice that I am experiencing this.</p>