Every mother knows what a pain it is to fit pants. You have to choose between getting it right on the waist or length.  Well, that doesn't apply to underwear, obviously, but I was concerned that even the 18 mo size would be too lose around her skinny thighs. They're not!
Great fit, it doesn't bother her as the falling 2Ts (which I'm saving for down the road). I love the extra padding for absorption of little drips pre-potty.
Having a 4 pack is also extra value! Great purchase.