DD wears Huggies size 4 (the cheaper Huggies--from Costco). She technically is still in the weight range for size 3, and I do still have a few around (in spare bags and such), and they do still work. But the 4s are just easier to deal with.
DD turned 2 last week. She weighs almost 25 lbs. and is about 33" tall. Also a peanut.