He's had it for years now. First i put it down to toddler diarrhoea but he's too old for that now.
TMI alert! It's very similar to butterscotch angel delight in colour and consistency.
He's otherwise fine and healthy, doesn't complain of tummy aches, has plenty of energy but is underweight according to his red book, 50th cent for height but 0 cent for weight.
Any ideas what it might be? Is it normal? Is it worth going to the GP?