@ms.jackson, she should not be in a backless booster yet, she’s too young. Baby should be Rearfacing until a minimum of 2, but ideally 4. It’s what is safest.
They’re adorable- but mama he needs to be Rearfacing with tightened straps and his chest clipped bumped, he is NOT safe like that at all. (She should also still be in a 5 pt harness). Please turn him back around and keep your littles safe.