Is that blood?

I would get it checked out. Could be a food problem like a dairy problem.

I get why you’re asking, it’s really hard to say. Better safe than sorry, I’d go in with the hope it’s nothing.

How many months your baby?

I think that is blood. I had to cut dairy and soy completely out of my diet. of formula fed then a hydrolyzed formula to start with and if that does not work then a completely dairy free formula. Definitely talk to the pediatrician.