When Roscoe gets ready for his cares (diaper, temperature, etc) they also switch his face mask between sizes, so that his skin doesn't get agitated from the same plastic being in the same spot on his face for an extended period. During that period of switching, we get to see his face with practically nothing on it!
As you can see in the picture above, they put an oxygen mask off to the side of his face and pump out higher concentration oxygen. That higher concentration in the air around him lets him stay off of the face mask for a little while longer. Here's a video that Alisha recorded while he had his face mask off:
Alisha also wanted me to point out that these pictures and videos were specifically for her "Nanny" (grandmother on her mom's side) because she bought Roscoe this outfit and Alisha thought she'd want to see him in it. Hope you all enjoy seeing the little tike!