Kids under 3 are free on Mears, but there's no guarantee that theyll get a seat, or at least that's what they told me. We booked a towncar so that we could use my daughter's carseat (she was 3 months old at the time) because when I called Mears to be sure there was no fee for infants the woman I spoke with said that they're free, but you may have to hold them on your lap since vans/buses don't have to adhere to the carseat laws. We could have just bought her a ticket for Mears, but if we did it was really almost the same price as a towncar so we did that. It was nice not to wait for the van to load and the grocery stop was great.