May 03, 2021 07:48 PM EDT Pregnant mothers, as worried and pressured as they already are during pregnancy, might have just unlocked a new way of finding out how to prevent their babies from growing up with allergies through their babies first poo! It looks like their poo won't be such a waste after all. Meconium, or a baby's first poo, is a fancier name for a newborn infant's first stool. It is a thick, green, tar-like substance that lines your baby's intestines during pregnancy. (Photo : Photo by Cleyder Duque from Pexels) It is believed that the very first stool to leave your newborn is bacteria-free due to their tiny intestines not yet colonized by microorganisms, therefore it is responsible for holding the starting material to develop the microbiome in our body and set up our immune system.