Thanks for the replies.

Well he's since done 2 very full 'normal' poos. So I'm guessing it was just wee. Just a new mum panicking I guess And yes.. it was a disposable. They are hopeless!!! Always leaking on me. And I've had several poo blowouts too with sposies. I've only got enough cloth for one day & night, then I have to use sposies while they're being washed. Must go shopping!