Hi we are travelling to Canada with Air Canada with DD 11, DS 8 and very lively baby 16 months. Trying to decide if paying £500 for a seat for the baby who never sits still is a waste when money is tight. We could sit him on our lap instead but he does weigh a ton! If we get a seat, we need a child restraint. DH reluctant to take huge car seat that may not fit anyway. Anyone got any advice please?