Over All Rating Reviews :
1. They don't seal easily, which means they might leak. This is especially an issue when you have a hungry newborn in one arm who wants his milk right away.
2. The bottles change color - I don't know if everyone will experience this, but some of our bottles changed to a brownish/blackish clearn tinge after we used the Avent microwave disinfecting/cleansing system.
3. You have to buy a different nib every month in the beginning - while others such as Dr. Brown's has the same nib for the first 3 months. It doesn't seem to add value to me to have to buy a different nib regularly.
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