4months old sleep sideways or tummy down

Is it ok to let 4 months old sleep sideways or tummy down ? Yes he already know how to flip his body from back to tummy. Or will it hinder his breathing or bad for them? Mostly for naps

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Because he is able to turn himself back. let him be. sometimes you shift also will disturb his sleep. just remember no pillows toys or blankets surrounding him. just plan flat firm mattress.