Mix and match seats and accessories to suit your family’s size, and make adjustments as it grows. The Baby Jogger City Select is sold as a single stroller, but converts 16 different ways. Reconfigure to seat two babies, a baby and toddler, or two toddlers with the optional bassinet, $90, car seat adapters, $60 each, or an extra stroller seat, $160. Seats can face forward, backward or in opposite directions. 6 months to 45 pounds per seat (90 pounds total).