I can't believe the O.P. sat on the completely unsanitary, germ infested seat cover on the aircraft for the whole flight.
People have farted on that seat, likely changed diapers on it, and picked their noses and wiped it off on that seat cover.
Didn't she DEMAND that the airline open a new seat cover sealed in plastic from the factory in front of her and install one on her seat and another on her son's seat before she sat on it?
Otherwise, just think of all the germs they were exposed to! Didn't her doctor give her a note stating that new seat covers were a medical necessity? If not, maybe she should sue that doctor for malpractice. Just think of the psychological trauma!
[And lawyers wonder why so many people hate them...]