+1 what Marty said.
For an infant get one that has the base that mounts in the car. Get the matching stroller and you can remove the hopefully sleeping infant, seat and all, and secure them in the stroller without her/him waking.
The ones facing backwards are safer and I think mandated by law when they are infants.
When the little Stig gets older make sure that it has the sides on it like your mothers wingback chair. When the little sprog falls asleep there is a nice place for the head to rest, again without waking.
I wouldnt and didnt invest a lot of $$ in one. They will outgrow it and if you wait a while betweene down loading dependants your wife will want a new one wich might not be a bad idea. How often do you replace your racing harness and helmet?
What ever you decide on make sure it is very tight in the auto seat. Hopefully your car is new enough for the built in anchors. If you must use the seat belt you can get a ratchet thingy at Wally World or We Be Babies. It slips on the cars belt and you ratchet that seat down till it is tighter than dicks hat band. Think of mounting a seat, you dont want YOUR seat moving around, Neither does Junior.
Hopefully your municipality will look at your install and make sure it is correctly done. They used to around here but the lawyers will no longer let them.
I worry about reincarnation. What if I’m not hung as well next time around? The Buddha said Not to grasp- life is transitory. Damn it some things a man gets used to grasping.