My baby's stool.... FTM

Kate
My baby is 6 weeks old, he was on newborn enfamil and got eczema. And he was spitting up a lot. Doctor said he probably has a milk allergy. So i changed his formula to gentlease enfamil. The eczema went away but he still has liquid green stools. And was very irritable yesterday. Has anyone else experienced green loose stool with your babies?