This can occur during feeding, when shaking the bottle to mix formula, or even when the bottle is simply resting on a surface. Mine leak all over the place I just purchased these bottles, washed and started using them
Leaking Philips Avent Bottles: Causes and How To Fix Them - Parent Intel
I made sure it was tighten all the way, tipped it upside down to check and it leaked again
I took the insert out to see if that was affecting the seal
Many moms have been frustrated by their avent bottles leaking Make sure all the parts are dry The nipple has a notch (valve) just below the number The white plastic nipple ring has a notch on it's upper rim
When you attach the nipple to the ring, make sure the valve on the nipple is placed directly over the notch on the nipple ring. Leaking baby bottles is very frustrating Have you tried different brands but still have the same problem Read on for some helpful tips to stop the leak!
Does anyone else use the philips avent natural bottles