Mom of 2.. Car seat placements.

Kim • Momma to a princess. 💖 Pregnant with a prince. 💙

I have a toddler(2 years) and I’m 36 weeks pregnant.. I have no idea where to install the newborn car seat, middle or passenger? Right now i have my toddlers car seat on the passenger back seat, idk whether to put her or baby in the middle.. helppp