We did not co-sleep with ours.
I am a very heavy sleeper and would not feel safe doing it.
Have you ever noticed that even on a firm mattress you create a depression? The baby is going to be pulled in that direction and when they're very small there's no way for them to resist getting pulled up against, and then possible under you.
Pony, agree that tummy time is really important but you have all day long to do it with them. It's not a reason to have them sleep face down.
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