When I was choosing bottles for my daughter before she was born , I chose Avent , Johnson & Johnson health flow and Play tex ventAire . When I brought my daughter home from the hospital I tried the bottles one by one . VentAire bottle kept on continously leaking inspite of all my efforts to use the bottle according to the instruction manual . It was hard to put together and take apart for cleaning . I was so disappointed with this bottle that I ended up throwing it in the garbage . Avent and J&J health flow are both far better than this and I am still using these two brands without any problems at all .