Any tips please? My 4-month old daughter's poo keeps escaping out of her nappy - up the back & out the top! Currently using Aldi nappies. She's only recently moved on to size 2 as is only little, but these don't seem to contain the poo, nor does the next size up, which we've also tried! Maybe it's just the force with which she poos! Any suggestions of how to stop this happening, or a better brand of nappy?