Instruct: Classify a review as either positive or negative.
Query: Flimsy Nipples = Hazard

The hole in the tip of the Stage One nipple split open after just 2 1/2 weeks, causing my daughter to take in too much formula. She suffered from vomiting and horrible gas pains after only a 2-oz feeding (she usually eats 5 oz). When I checked the bottle and rinsed the nipple, it had split so far that the nipple brush went straight through! I immediately changed back to my Avent bottle and she's had no problems. My Avent nipples have never split, caused gas or vomiting. The air flow design of the VentAire bottle may be a great concept - but beware of the flimsy nipples.