The bottles are excellent and the nipples as well. I don't know if they help with colic, but they definitely don't make it worse. Plus, in terms of hygiene, they wash perfectly without leaving any residue anywhere. My little one is almost 3 months old and we are already on level 3. The issue of nipples is subjective. Each child takes their own time with feeding. The times and levels are indicative. We kept level 1 for the first 1.5 months, then she started leaving milk, still feeling hungry and whining. She was eating intermittently and getting fussy. So, I switched to level 2 and everything was fine until a week ago when she started the same thing again. I got level 3. After noticing that other brands have an age range for a nipple from 0-6 months, I thought I had nothing to lose. She doesn't even choke, she enjoys drinking, finishes the amount in the bottle, and always asks for more because she continues to suck persistently even after finishing. She doesn't constantly eat her hands like before, even if she had eaten. She sleeps more peacefully because she is satisfied.