I have a question for those with twins. We are currently using 2 Graco Snugrides with 4 bases ( 2 in my car and 2 in DH's). Because I'm still off of work with the babies we really haven't had them in DH's car very often. I thought we would get pretty long use out of the Snugrides becuase the twins were smaller than average. Unfortunately, it looks like they're going to exceed the height requirement (29") long before they exceed the weight - probably in the next month or so. I managed to get 2 of the Britax Marathons that Target was clearancing out last week (50% off ) so we have those when they're ready. It looks like I'll be going back to work in the next month or so and the babies will be going to the daycare at my work. My husband works shift work (24 on, 48 off) and wants to pick up or keep the kids home with him sometimes. Would you buy 2 more car seats?? It seems like it would be a hassle to keep moving the marathons. Not to mention, I doubt the day care would like me leaving those huge seats there for my husband... I guess it's normal for parents to have a car seat in both cars for their baby but with twins buying 4 seats seems ridiculous. Do any of you have 4 seats?