Who puts baby under 5 months tummy down to sleep

Marilyn
She sleeps tummy down on us but Iam too nervous to leave her over night like that. Also to place her  tummy down in her crib is nerve wrecking and I can't sleep.  she sleeps a little longer tummy down.  She hasn't been sleeping at night and we're tired. She's been waking up after 20 mins if alone . I don't co sleep as I don't trust it either 

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