You baby most often sleeps..

The past two nights my son has made me anxious by going onto his side during the night. The little guy decided tonight he wanted to sleep on his tummy. No matter how many times I pushed him back he kept rolling over. I'm terrified. Please reassure me this is okay at 4 months. He's been rolling onto his tummy during playtime for a few weeks, but hasn't rolled tummy to back since before then.

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