Tummy Troubles

One of my kids has constipation and screams as a result from the constipation and gas. It’s heartbreaking to see her like that. We took her to the pediatrician and they suggested probiotics. We started her on probiotics + fiber in their chocolate almond milk which has helped a lot. We decided to try the route also of going dairy-free and gluten-free. Has anyone made this change and notice a significant difference?