For those who suggested it - a snugli is NOT a good idea. First, it's bad for the baby's pelvic development. Second, it would be directly in front of you, preventing you from seeing the table, causing you to have to back your seat up into the precious space that everyone seems so concerned about, and would be risky for the baby if you should be eating or drinking anything HOT! Also, I realize that some strollers have a large "footprint" but so do highchairs, as well as infant seat slings (Koala) that hold a baby seat. If you have a concern that you cannot get to the buffet, then ask to be seated somewhere else - or don't go to a buffet. We don't go to buffets because we'd have to take turns getting food and one of us always ends up with cold food. So, we do table service. Disney is great about having Character meals with that option. I mean - there are dozens of options there. It's Disneyworld! And if we took turns eating, I'm sure that someone out there would be ticked because we were taking way too long at "their" table and they had to wait for their ADR. I think people just get so pissy about things that don't really matter in the grand scheme of life. If you're going to let that ruin your day, stay home!
Now, we have a similar predicament. Our son will be 3-4 months while we are there. I called and emailed guest relations and explained the situation, asking what our options are. They said that they do have infant seat holders at some restaurants, and that they do have reclining high chairs at some - but that they can never "guarantee" one or the other because they rotate them. It seems absurd to me that they would do this.