when making ressys, do I count the baby as a guest (we will probably need a high chair) or do I just make it for 5 since that is the # of us eating?
I do believe you would count him as an infant so yes he would be considered a guest. ; I know when you go online and try to book reservations, it will ask you number of children and what age. ; That way they will have a high chair ready for you.
