I am so overwhelmed trying to decide what type and brand of car seat to get. I am planning on going back to work after my maternity leave so we are going to need seats of both of our cars. Should I get an infant seat and two bases or 2 covertible seats? I am concerned about the chemical leaching in the fire retardant material so I don't plan on leaving her in the car seat unless she is in the car. Any thoughts would be greatly appreciated!