These bottles are WONDERFUL! I've used them now with both my son and now my daughter. They allow good airflow and when I use these, my daughter doesn't spit up nearly as much. They're fairly affordable for what you're buying and Dr. Brown's offers many options in sizes and color. The only down fall of these bottles is how long it takes to clean them if you have to wash by hand. There are so many different components that need cleaned (bottle, nipple, cap, lid, inserts) and it gets somewhat time consuming. Otherwise, these bottles are great and we have six of them and will probably continue using!