N.Z.
I don't know if the old Avents did this, but I bought them and hate them because they leak non-stop. I heard to pull the nipple or tighten them tighter but nothing keeps them from leaking. There have been times that my daughter is soaked from the formula leaking. My friend uses born free and loves them. I haven't used them myself but I recommend them. I tried Gerber Nuk, I like them except when you need to shake a bottle the cap doesn't cover the nipple completely and they leak like crazy.