For reference I have a 4 year old and (obviously lol) a baby on the way. We have a Toyota Camry and Corolla so space is limited. We do plan to upgrade to a rav4 but that may not happen until after baby arrives.

My question is, when should I move 4 year olds car seat to the driver's side to install baby's on the passenger? I want to have it in the car soon after 30 weeks just in case (so we have just under a month) but idk if we should install baby's on the driver's side until delivery at the hospital so 4 year old stays in the safest spot?