Double BOB adapter needed for how long?

melaniedel

I just bought a duallie, and wondering if I wait a few weeks I can just use an infant insert. I didn't get my single BOB until DS 1 was 4 months. I read their site, but just wanted to post and see what others did, too. 

Thx! 

Brit's Luna154

My pediatrician wanted us to use the car seat adapter until DD could sit up on her own, so maybe six months?

Sunfish22

I started running with my new, double BOB, when DD#2 was 6 weeks old.  I had the infant carrier adapter, and then my 2 year old rides next to her.  As long as she is in her carseat, there are are absolutely no worries or problems.  (I'm als