My 5 wk old sometimes has little teeny spots/strings of red blood in his poopy dipes. My older son had this too as a newborn and his pedi said its probably a fissure near the anus. However I read that it can be from overactive letdown as well. I notice he'll have a couple diapers with the blood spots (SUPER small amt) and then a couple days without. I only remember my older son having red blood 1 or 2x and my newborn has had it a number of times. His behavior, eating habits are normal and he is very content and happy. So, I really don't think anything is wrong, but curious if other moms notice this sometimes. Is it something that usually only happens as a newborn when they are pooping a lot? My newborn poops almost every nursing session.