I used these same type of bottles when my oldest child was a baby, and now I'm using them again with my newborn. I've never had any issues with them and I think they're great bottles. They are easy to clean, although there are a lot of parts. The bottles seem to reduce gassiness since my baby doesn't spit up too much after drinking from his bottle. I started using these bottles within a week of baby's birth and they haven't caused any nipple confusion - he is still able to nurse without any problems.
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