This bottles were a good idea, but it just doesn't work. I tried these with my son because I thought it would be helpful. I have three kids, and I'm in school. I am always so busy, and I need any help I can get! I thought I would be able to lay him beside me while I'm doing my school work on the bed. He could pretty much feed himself while I wrote papers. It was a nice concept, but this bottle was just ridiculous. First, the nipple kept falling out of his mouth. I would have to pick it up and put it back in every couple of seconds. Second, he could not suck on the nipple hard enough to get the milk to come down the tube. He wasn't able to do that until he was about 6 months old. By the time he was that age, he was able to roll over. I would put it in his mouth, and he would roll over and it would fall out again. On top of these bottles not working, I read that they are dangerous because they are a choking hazard. A baby should never have a bottle in their mouth without someone holding it. Do not buy these!