What do you think of the sizing difference between Hanna Andersson's 80cm vs. 90cm pjs? At the store, they told me size 2 would be 80cm. Came home and checked online for more sale sizes and it says 80cm is 18-24months and 90cm is size 3. I've been buying only size 2T going forward. K seems average height (but low in weight) for her age. Almost 22 months.

Not sure if I should listen to the SA and get 80cm or 90cm. Seems like a big jump?