Last summer at Teppanyaki, we had an ADR for four. My mom was under the weather that day and decided to stay home from the parks and my father stayed with her. When we showed up at the podium, we explained the situation, and there was no issue. We were placed at a table with two other families, so it didn't really matter anyway it seems. Plus, if you are only leaving the baby at home, who probably would have taken up just a high chair, it won't make much of a difference.