Did a search and didn't find what I was looking for...
Moms who already have a kid at home: what's your car seat configuration? Googling only lead to confusion for me. I know middle is "safest" statistically, so I want to put the new baby there. However, what I read says that rear-facing is intrinsically safer than front-facing, so actually a front-facing car seat kid ought to take the middle before a rear-facer does. THEN there's the whole issue of the car not having anchors in the middle, so if they're next to each other, they'd be sharing an anchor, or else one of them would be held in by only the belt, and everything says that holding by anchor is safer than belt. Not to mention, I have no idea how DD will behave sitting next to a new baby. I don't worry about her hurting LO or anything, just poking at him or her (because she's a curious and learning 2 year old) and otherwise upsetting baby.
I guess I kind of have talked myself into having one kid on each side, but I'm curious to know how you all have handled it in the past or plan to handle it.
Re: Two car Seats
Anchors are not shown to be safer than the seatbelt, the only difference is that anchors tend to be easier for people to install.
If you use the middle seat, it is not okay to "borrow" the anchor from the seat next to it. The anchors are on designed for one car seat in the seat that the anchors are on (usually the 2 outer seats).
Here is a good resource on the LATCH system: https://thecarseatlady.com/latch-weight-limits/
I would also encourage you to read your car seat and car manuals!
Good luck!
DS1 01/08/03 DD1 08/11/04 DD2 10/06/08 DS2 09/30/14
SURPRISE! Hannah May born 01/22/16
DS1 2010
DS2 2013
DD1 2016
BFP #2 - EDD 1/25/16
DD 12/20/99, DS 12/14/12, M/C 9/2014, M/C 1/2015
DD 12/20/99, DS 12/14/12, M/C 9/2014, M/C 1/2015