As soon as they could roll themselves onto their tummy by themselves. I always put them down on their backs, but if they rolled onto their tummies, I left them sleep like that. My kids were all wrapped until 8 - 9 months so they slept on their backs pretty much until then. SIDS guidelines say to try and prevent them sleeping/rolling onto their tummies until after six months (wrapping and sleeping bags can help prevent them rolling earlier). So 12 months should be fine
ETA: If you want the SIDS link for your DH, I can post it for you![]()





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