Adding a Toodler to Hoop De Doo reservation

My 2 year old son will be coming with us to Hoop De Doo. We have a reservation for 4 (2 Adults and 2 Kids 8 and 7) My son will be a 5th guest. He is free on the dining plan but will be a 5th. Can he sit on my lap or will let me add him to the reservation at the door and use a high chair? Or will they make us cancel the reservation? Any one have any experience with an issue like this?

I should add that there are currently no reservations for 5 available.

I would just call. I can’t imagine it would likely be a problem. Plenty of tables of 3 at a 4 top.