I used neuropro the first 3 months, then switched to Similac, I just used the whole can and went on to the next kind, I never mixed and never had a problem, but didn't think about it being a problem either. It anything u might work about constipation, but at 6 months you can feed prunes or prune juice in their bottle to help with that. And you can get A LOT if coupons for neuropro! Ask your doctor if they have any tips.
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