Switching formula

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I’m considering switching to enfamil. Right now I’m using similar pro advanced for my son and he is 6 months old. I’ve heard alot of issues pertaining to the formula. I haven’t had any problems and my son is fine but I just get worried about the quality of similac. I’ve seen on Facebook this woman found a huge chunk of mold in her formula due to the expiration dates being incorrect. Any mommas out there that could possibly give me some helpful information on switching formulas and what would be best for my son? I don’t know if it would hurt his tummy or have a negative reaction to switching the formula so how do I go about it? Thanks!