I think it would be frightening for a 2 year old.
It gets very dark and loud, and at one point, when it is dark, Stitch does things that you can feel. Some kids will scream, which may also frighten.
My 6yo cried. She said later she liked it, and would go on again, but during the show, she was very scared, and cried.
This is from the WDW website about the Stitch attraction.
Category: Mild But Wild Thrills
Land: Tomorrowland®
Height Requirement: 38" (95 cm) or taller
This attraction has FASTPASS.
Additional Information
This attraction may be frightening for children.
I would suggest you use the babyswap 1st. You or someone else go in, then determine whether or not you want to bring the baby in.