I've noticed that my baby boy who is 4 months has had wet puss in his nappy today. Not in every nappy that I've changed, but about 50%. Not alot, but a couple of little blobs. He's also had dark grains in his poo for a week although he's only had 3 in the past week.. A bit sand-like. He's exclusively breast fed.
Any ideas what thus could be / should I be worried?