Good night ? There's a problem, the baby started turning on his side,…

Good night ? There's a problem, the baby started turning on his side, trying to lie on his belly, he sleeps on a pillow, it's shaped like a butterfly, in the middle there's a special space for the head, so there's nothing there, and on the sides stuffed with cotton or something else, well, not really important! He sleeps on it and when he tries to turn over almost gets his nose stuck in it and his mouth, so one nostril breathes while the other doesn't, I think I'll take it off altogether, but just now I went to look, he's lying on his side and face-down in the mattress, now I'm afraid that he