Picture on the left is of my baby covering her face while fast asleep. It can be very dangerous and suffocate her if I didn't see her doing this. She was in deep sleep that she wasn't moving at all.
This blanket as I remember was wrapped from her waist down to keep her warm but she moved too much that it covered her whole face. Now I have to watch her carefully and check on her from time to time when she's in the crib to avoid this from happening again.