Originally Posted by
Antonio8069
In the Arrivals hall you can buy a 24 ticket on the 747 Express Bus to downtown. You can get on/off the bus as often as you wish.
With a baby this might not work as well as a taxi/uber with a car seat. I would recommend getting a nearby YUL airport hotel for 5-6 of the 7 hours assuming your luggage should be checked through to YHZ.