Girls, how to fight constipation?! We're without a week - 2 months. A …

Girls, how to fight constipation?! We're without a week - 2 months. A week ago, the constipation started. I changed the mixture. From it and began. I waited 2-3 days and helped the baby, but the stool doesn't settle… I give him Eubiotic, a neurologist advised, because we have... How to fix the stool for the baby!? Maybe someone knows the ways?????