How do you get my son to do number 2 in the toilet?

Encourage your son to use the toilet for number 2 by creating a positive and relaxed environment. Establish a routine by having him sit on the toilet at regular times, especially after meals. Use rewards or praise for any attempts he makes, and be patient, as pressure can lead to anxiety. If he resists, consider reading a story or using a fun toilet seat to make the experience more enjoyable.