I love the Avent 9oz. BPA free bottles, but I hate the fact that every time I put the top on, somehow it is always crooked (on every bottle) and it leaks. I dob't think it is me, but again it happens every time. I don't know what I am doing wrong. Also they are  a little pricy, but fit within reason to my tight budget. Other wise I like them and feel secure in knowing that they are BPA (Bisphenol A) free. My baby doesn't have any issues with them either. They also clean easily. I have been given a few different types of baby bottles, but the avent bottles are what I prefer, especially due to the...