Absolutely. It sometimes takes a few weeks for our more reserved students to get comfortable enough to participate. That’s one of the reasons we offer classes in 6-10 week series rather than drop-in. Toddlers especially need time to get used to a space, a group of people and an instructor.
Even once they are comfortable, some more reserved little ones may be more watchers than doers in class. That doesn’t mean they are not learning and they may be more inclined to practice at home.