HELP MY BABY CANT POOP

Nicole
I need some suggestions to get baby Solomon to poop! He is very constipated and has terrible fits of grunting and straining with no success to poop except to pass a little gas. He is on formula (similac sensitive) and I've tried to dilute his bottle a bit with 4oz of water and a scope and a half of formula. All suggestions are welcome to get baby to get some dookies produced!!! Thx.... this picture displays an extreme strain with no real action, poor baby!