Overall, I recommend this belt.  It seems substantial enough to last but only time will tell.  Some belts seem substantial but fall apart after creasing.

My child's waist is just under 19" (2 year old).  All the other belts I have are XS.  This XS however seems a tad too small.  This particular belt in XS has 7 close together sets of holes closer to the end of the belt and the further you go in, has 9 additonal sets of holes further spaced apart.  When I put the belt around my child's waist against the skin with no pants, the belt fits snugly and securely on the 7th set of close together holes, with the expected amount of tail left on the belt.  Once pants are on however, I am forced to use the 4TH OR 5TH set of the closer together holes nearest the end of the belt.  This leaves enough of a tail to get into the next loop after fastening, but because of the type of buckle system, it takes a little more effort to get the tail into the next belt loop and would be easier with more of a tail left.

I am going to have to reorder this belt in the next size.  I suggest you accurately measure your child's waist and consider going up one size to have the expected amount of a tail left after fastening, especially since the belt material is somewhat stiff and the buckle and fastener are a bit more rigid than a typical belt.  Since the buckle screws on to permit reversing the belt, it has less give than a belt that lacks this feature.

Hope this helps.