For longer trips: Remove the parts, collar, and nipple from the bottle and screw on a travel cap. For air travel:

Brown's bottles often leak during feeding due to improper assembly of the vent system or nipple. If the vent insert is not seated correctly or the collar ring isn't tightened properly, gaps form that allow.

Dr. Brown's Natural Flow Anti-Colic Options+ Wide-Neck Baby Bottles 9

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