Hi, my 19 week old has been on solids for 2 weeks now and all going great. but suddendly up all night screaming. poo is more solid too. he gets veg puree at 11 and then fruit puree at 5 with baby rice and then takes between 6-8oz of milk at 6.30 before bed but now seems to get awful tummy ache suddenly. any tips for what I should do? thanks