1 ï»¿Normal breastfed baby poopï»¿ is usually a mustardy yellow color, grainy in texture and quite runny (unless it's the first few bowel movements, that are dark in color because of the meconium, discussed above). 2  Many lactating mothers say that their babyâs poop does not have a bad smell, but rather a sweetish smell.ormal Infant Bowel Movements. ï»¿ 1 Normal breastfed baby poopï»¿ is usually a mustardy yellow color, grainy in texture and quite runny (unless it's the first few bowel movements, that are dark in color because of the meconium, discussed above).