Is this a sleeper or a two-piece set?

It is a two-piece set: a long-sleeve printed top and matching bottoms. There are no enclosed feet, so it is not a footed sleeper.

How do the snaps work for diaper changes?

The top opens at the front with snap buttons, so you can lay the baby down and close it without pulling it over the head. The bottoms have an elastic waist and come off separately.

What is it made of and how should I wash it?

It is 100% cotton. Machine wash with like colors and do not iron directly on the print.

Will the print fade or crack?

Printed cotton can fade with hot washes and repeated drying. Washing cold and inside out, and skipping a hot iron on the print, helps it last.

Does it run true to size?

There is no size or fit guidance beyond the listed sizing, so check the measurements before ordering. Cotton sets like this usually fit best with a little room.