So how do you get a 2 month old who only likes to nap in the car to take a nap? Convince him he is in the car, of course!
(by strapping him in the seat, turning on some music, then bouncing/swinging/rocking the seat until he’s asleep)
Then he’ll sleep for over an hour!!
…of course, this will only happen on the day your two year old decides NOT to take a nap…