Tegan
Not much i can say other than it's something they all seem to go through at some stage. I have the car seat problem also with Alex he hates getting back into it after we have been out. With the arms coming out of the straps i now won't start the car until the arms are back in as Kimberley takes hers out all the time.

The other thing i can think of is that Lily can sense what is going on and that the new baby will be here soon and she won't be having your attention all the time.