After much searching for a bottle that would work for my son, I found the playtex drop ins system. We have seen a dramatic decrease in colic, hiccupping, overall gas and spitting up. The system allows a busy mom to just simply throw the liner away with one less thing to clean. Also the liner because it collapses mimics breastfeeding. The system has a variety of nipples from latex to silicone, slow flow to fast flow as well as cereal Y cut flow.  The playtex drop ins liners can alos be purchased using a generic brand which helps with a tight budget. The bottles have numbers that do not rub or wash...