We took DH's truck to Christmas in Iowa yesterday (it's a 1.5 hour drive) and Laila rode in her Vivo booster (we have lots of snow and drifts and I decided she sits well enough in it to not wrestle her Nautilus out of my car and switch them). When we got up there, she said her back hurt and then when we got home (she fell asleep) and I got her out, she said her butt was sore too. That's the first time she's rode very far in it, is this a common complaint or was she just being a drama queen? (very possible)