It is most likely that your baby son's dark stools are due to blood that he has swallowed. The most likely source of this blood is a crack in your nipples with some bleeding while he is breastfeeding. If you are absolutely certain that your nipples are no longer cracked then you need to know where the blood you noticed your baby spitting up is coming from. For this reason it will then be best to ask your paediatrician to examine your baby.
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