I'm dying to run again! DD is 10 weeks and we use the Britax car seat adapter on the double BOB. Do people run with the infant seats? I saw a mom this morning running with her double BOB and she also has the adapter for the Britax but I know her baby is a month older too. I know it's not suggested to run with them in the regular seat until 6-9 months...I'll probably ask the ped but I want to know what others have done.