I stopped breastfeeding about a month ago and put her on regular powdered enfamil then switched to gentle ease because she had gas with constipation now she's just constipated. It breaks my heart the see her strain and struggle soo much to poop. I gave her prunes, apple juice, pears, water.... nothing helps. I cut out solids and gave her enfamil reguline and it made her throw up. Any suggestions on formula?