Re: Carseat question
I doubt a 44" tall child will still fit the harness on this seat -- it has very low top USABLE slots (top slot is deceptive: only safe in booster mode as per the manufacturer).
Google Dorel Juvenile & you may find the manual online ... or call the toll free number on the seat to ask Customer Service for a new manual.
What vehicle year, make, model? He probably won't fit the harness by height & you might be able to engage the seatbelt retractor to lock shoulder belt as added precaution to help ensure he stays properly positioned.