Baby sleeping on tummy

my baby too. He started when he is 5mth old. Don worry I was worried at first. I tried turning my baby to sleep on his back twice but realised he sleeps on his tummy again. baby would adjust his neck to breathe properly. since he can turn and flip on his tummy. I think some babies enjoy sleeping on their tummy. In the end I just let him sleeps on his tummy. He sleeps better and longer too. Just make sure the cot does not have any blankets, pillows that would obstruct baby.

You shouldnt be worry as long as she's comfortable with her sleeping position, no pillow/no blanket around her (safety wise) and her face facing either left right to avoid suffocation. You shouldn't adjust their sleeping position because end of the day, that's their comfort level of sleeping. Both my kids loves to sleep in that position.