I’m hoping y’all can shed some light for me! My son is 4 months old, 13 lbs 11 oz, 24.25 inches long. I’m wondering when I can remove the newborn inserts from his car seat?

It’s starting to get tight on him and he gets so hot in his car seat! I freeze up front while driving because if I have any type of heat on, it’s even worse. I’m talking like...a complete sweaty back and neck. He ends up screaming and crying because he’s so uncomfortable.

Here’s the car seat:

Thanks!