Side-ways sleeping

Hello helpful community! I need some guidance please. My baby is five weeks old. As his moro reflex kicked in a couple of weeks back, I noticed that the only way I can put and keep him asleep is by putting him down on the side. I alternate each side. I also noticed that my baby turns on his back automatically during his sleep.

I know the advice is always to put the baby on the back but is anyone else doing the same - as in side sleeping? I’m anxious.