I really liked these bottles. My son was unable to hold his own bottle upright but could still drink from these bottles while holding it himself because of the drop in bags. All you need to do is make sure you push out the air before giving it to your baby. I still have all his bottles and plan to buy new nipples and use the bottles again for my new baby. I found them easy to clean. We originally started out with the gerber bottles and didn't trust them to get clean in the dishwasher so we had to handwash and sterilize them which doubled the amount you had to do. Playtex bottles go right in… read full review »