Hi Melissa! November is a great time to visit Walt Disney World! The park attendance levels are generally fairly low in November so crowds should be light for most of your visit. The parks do see an increase in attendance around holidays, and since many government employees and school children have November 11, Veterans Day, off, you may see more people in the parks on that Monday and the weekend prior to it, but the crowds should be low for the rest of your trip.
The weather in November is generally comfortable. High temperatures average in the upper 70s with lows around 60, and it's typically the least rainy month of the year at Disney.
Your son would have a ball celebrating his birthday at the
Hoop-Dee-Doo Musical Revue! This dinner show has lots of corny jokes and fun songs, and the performers really fawn over guests celebrating special events. The all-you-care-to-eat meal is really tasty too.
Come visit us again at the Moms Panel if you have more questions! We'd love to help!