When choosing sheets for the crib, take the following features into consideration:
Fitting
There are two major types of sheets: fitted sheets and flat sheets. Never use flat sheets! They are a proven safety hazard. You want a fitted sheet with a strong elastic band that is about one inch wide—a sheet that fits like a second skin. There can be no excess fabric for the baby to grab or pull on.
Thread Count
The higher the thread count, the thicker and softer the material, the more expensive. But your baby will be more comfortable and the higher count sheets last much long. It is better to buy a few sheets that are more expensive than buy many sheets of a lesser quality.
Weave
The standard weave pattern is one stitch over, one stitch under. This is a durable stitch, and it makes the sheet soft to the touch, but it is also more susceptible to wear and tear.
A percale sheet has a tighter weave and is a higher quality. It is strong and durable and has that crisp feel that many people prefer.