A riddle

If a little girl who is four months old is:

1. Not supposed to be able to roll from back to front for another couple months;
2. Sound asleep;
3. Tightly swaddled;
4. Placed on her back in her crib...

Then, can she end up on her tummy, still sound asleep?

Theoretical answer: NO!

And yet, the Lela-answer: