Our son has asd and also he is hypermobile. He can't manage to walk for more than 20 mins and also can't handle being in crowded places. would I be unreasonable to put him in a pushchair for one day whilst we are away so we can go on a special day that he really wants to go on ? Would he fit in a phil and teds classic, he is over the weight limit by a bit and not much taller than a lot of 6 year olds. Thanks