@johnd Don't confuse the exception with the rule. And most flights don't include an empty row of seating to take the pressure off of you, so I wouldn't really include that as a normal experience.
@henry_ Kids sleep in the most ridiculous and uncomfortable looking positions. Totally normal. I will say that it looks like you still have the mattress in the infant position. It might be time to lower it down, to eliminate the risk of rolling out.