If you are looking for answers to this question, you may be worrying too much. First of all, it is the ingredients that can cause constipation. So, if your baby is showing symptoms after consuming the porridge, you better book a consultation with an expert. The child may have certain allergies or there can be an improper diet plan or any other reason because you never know with the newborns. Typically, certain cereals and porridges might not suit the babies, for instance, high fibre food such as broccoli or banana. Also, it is best if you feed your child more water if your little munchkin is facing hard to poo.