Dr. Brown's Natural Flow Options+ Narrow Baby Bottle Conversion Kit - 4oz/120mL

The replacement pieces match the original perfectly, so the bottle works just like new without any leaks after a few washes. The kit saved me from buying a whole new bottle when our old nipple started stretching out.

We lost one of the vent pieces during a midnight feed scramble, and this kit had exactly what we needed to get the bottle working again. The nipple and collar feel just as sturdy as the originals, which is a relief since our baby is a aggressive chewer. Worth grabbing if you're down a part and don't

We were down to one working bottle after losing the vent inserts, and this kit had everything we needed to get our stash back in rotation. The pieces snap in exactly like the originals, so no wrestling with the collar. Feels good to have spares on hand now.