Poor quality

Very disappointed in the quality of these bottles. Used them 5 years ago with my 1st born and had no issues! Bought new ones for my newborn. She uses stage 1 teet as stage 2 is still to fast (she's 9 weeks so should be able to use stage 2!). She ends up spitting out some milk and can actually hear how much air she's swallowing with stage 1. But the worst part of this stage 1 is that it is leaking, half the formula ends up on my daughter's chest!!! We've changed the plastic top but the teet is the issue. Surely there should be a guarantee on the bottles and teets? If I wanted poor quality I would have bought non-branded bottles.

Hoping to hear back from Philips Avent