Ava is our first child and a friend of ours recomended Dr. Browns bottles-- We registered for another kind along with the Dr. Browns, and we WON'T use the others. Ava doesn't have the spit ups, or near the gas that you hear and read that babies have. AND burping is so easy! We have been so happy with the entire set! All of my friends and family having babies, I have told them they HAVE to have these bottles, they are a life saver! We will never use another brand of bottles!