At first I had my newborn son on Avent bottles but he was constantly spitting up and very gassy. I remember a family member only using dr brown bottles and I originally was gifted a set for my baby shower. Those were with the old blue piece. I got the options bottles and I don't understand what these moms are doing to have it leak. My bottles do not leak at all and I love the new option bottles. But in all honestly if I had to buy another set I would go with the blue piece. It's a little cheaper and does the same as the options for my son.
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