I have three children. For the first one, I bought all those curved Healthflow bottles to keep the air out of my daughter's system. Big Pain!!. They were hard to clean. I used the Playtex bottles for my two younger children. They are much easier to clean. I could even put the rings and caps in my dishwasher. I would recommend these bottles to any mother. There are a variety of nipple shapes available to experiment with. My daughter liked the natural brown ones and my son liked the rounded top in the brown and silicone varieties.