Dr. Brown bottles

Abigail • 03.25.2019. The day my life changed forever.

I have these four different types of Dr. Brown bottles. Two kinds are 4 oz. and two are 8 oz. Does the size of the vent matter? Obviously the small vent would go in the wide neck 4 oz bottles, but would I put the medium vent in the regular 4 oz bottles and wide neck 8 oz. Then use the large vents for the 8 oz regular bottles? Sorry if this is confusing!