Hi and Welcome to Mothering!!
What a wonderful surprise for your family! :) Our Baby section should be right up your alley! I would also point out our Family Safety forum, which is great for all the latest in car seats! I know how much changed in the 6 years between my kids, so hopefully that will be helpful! ;)
Adina mama to B 4/06 and E 8/13/12 (on her due date!)