These are a must if your baby has tummy problems, keep in mind they are a pain to wash. If not washed properly they can grow mold/ bacteria that will get your baby sick. I’ve never had a problem but just make sure to wash/ boil them properly. [product:dr-browns-standard-bottle-replacement-vent-kit-8-ounce]

These bottles are okay just have soo many parts you have to take apart and wash and then let dry

When some older pieces started to fade in color and quality, I found these! I think it’s amazing that dr brown sells just replacement parts and you don’t have to buy a whole bottle. I’ve also been told if you contact the company they can sell you the 4oz replacement pieces as well.