Sleeping position

If baby is able to turn and flip easily, don't have to worry. He will know how to adjust himself. My baby started to sleep on his tummy since 3 mths as he was able to roll by then. I always tried to put him down in the cot on his back but he will still flip on his own and will cry if I turn him bck. Till now at 7 months, he still prefers slping on his tummy and he never suffocates before. Just make sure tt his cot is clear of pillows and toys.