We are in the process of starting our first Centering Parenting group. We have been hosting Centering Pregnancy groups for quite awhile now and put the parents together by due dates. (June due dates in one cohort, July in another, etc). We are struggling with how to group the infants into cohorts because of the immunization schedule. EX: If we grouped children with DOB Aug 1st-August 31st and we hosted Session 3 on Dec 15th then several of the children in the group receive their immunizations too late and the rest would be too early. I read that some of the CenteringParenting have put multiple ages in a cohort. How it this done and how do I ensure that the children receive their immunizations on time?