Sorry, no idea about why it's such a big explosion and I can't remember DS1 having that sort of reaction back then to it, but he only started solids slowly close to 7 months. All I can say is that usually when my boys (yep, already happening with DS2...) have explosions that go all over, it's usually a sign I need to go up a nappy size even if the others still do up. Other than that, DS1 still has much bigger and runnier poos when he's had a lot of pumpkin. Strawberries also give us issues with nappy rash, but your little girl wouldn't be having them yet anyway I'm guessing. Her body is probably just getting used to the whole solids thing still - how long has she been trying solids?