Hello, if your grandson is breastfed, he is not likely to be constipated. Breastfed babies almost can’t produce any hard stools, because the breast milk is so easy to digest. At around one-month-old, babies usually start passing stools less frequently, so in such case, it can be that the baby’s digestive system is simply maturing. If the baby is formula-fed, the risk of constipation is higher. When the baby is truly constipated, you can try giving him a little bit of boiled water, possibly also adding just a little bit of prune juice to the water. (Not much, start with a tea spoon in total.)