We’ll be taking our 10 month old son to WDW for the first time and trying to decide which is better, April or May? We would want to go when it’s least crowded between those two months.
Late April (as far away from Easter as possible) and early May are some of the least crowded times at WDW now, as well as some of the nicest weather - not as hot as summertime, not as humid, and not as much rain. So maybe last week of April, first week of May.