Quoting heather718ky:" http://www.dmv.org/pa-pennsylvania/safety-laws.php#Child-Car-Seat-Laws go there "
Quoting Moses.:" That is extremely dated. OP, your best bet will be to go to PA's dps site. You should be able to find ... [snip!] ... find something there. I don't think I have ever seen a state where they couldn't legally ride in a booster at 4 AND 40 pounds."
Quoting Spoonful of Jayson:" When you say booster, do you mean a high back booster with the 5-point harness? OR just the SEAT booster with the seatbelt?"
Quoting Moses.:" Just a booster, whether it is highback or not. Here is this http://www.justdrivepa.org/Resources ... [snip!] ... to law they must be in a 5 point harness until 4. Then a booster until 8. Ideally until they are 4'9 but law is only until 8."
Quoting Spoonful of Jayson:" Thanks! My mom has an older 2 door sebring convertible so this is ideal for that. She has to either put the top down or maneuver everything around to buckle him in lol"
Quoting Moses.:" Oh yeah, for a situation like that, a booster is definitely better than a seat that really doesn't fit. "
Quoting Spoonful of Jayson:" Yeah, I have an SUV, so we are good there. If you use a high back booster with the seatbelt, what do you do with the harness straps? just sit on them or take them out completely?"
Quoting BetterOffSingle!:" 4yo 40lbs and they should be able to pass the 5 step test (5 step test isn't law, but it shows if they are ready for a booster and SAFE in one)"