Loud patterns on blankets may overstimulate some children.

Your preschooler's day is a whirlwind of learning activities, playtime, meals, snacks -- and naps. You might send your child to preschool with her special blankie, all tattered and torn, only to get a note saying she needs a more acceptable choice for nap time. Do a little research to make sure your child's blanket will pass the test.

No Holes or Tears

You know all too well that when your little one loves her blanket, you can really tell. Holes begin to form, and edges become tattered and torn. While these signs of a much-loved blankie might be fine at home, they could be unacceptable at preschool. If holes are big enough, they can pose a safety risk for little heads or limbs, and small bits of torn fabric can become choking hazards. Plus, the flurry of activity at preschool may subject the blanket to further wear, making it downright unusable.

Hypoallergenic Materials

Does your preschooler itch every time he wears a wool shirt? If you don't wash certain fabrics, does it cause him to break out? Keep your little one's skin in mind by choosing a blanket that is hypoallergenic and made with materials that are safe for all skin types. Hypoallergenic materials including organic cotton, hemp and certain synthetics will let your preschooler cuddle up in comfort without causing a skin problem for you to deal with later.

No Embellishment

Your preschooler may fall in love with a blanket that has dangling fringe or decorative accents, but all of those dangly things may cause problems in preschool. If not properly attached, decorations and fringe may end up in another preschooler's mouth. Plus, all of those little doodads can keep your child awake as she fiddles with them when she should be sleeping. Choose a low-key blanket with simple edging, simple stitching and nothing fancy.

Simple Patterns

Is your preschooler stimulated by bright patterns and cartoon designs? Your little one may want to bring his superhero blanket to preschool for nap time, but he will have an easier time sleeping without staring at the bright patterns and colors. Find a blanket that has simple patterns -- or even no pattern at all -- and muted colors. Pastels and soft shapes may help your little one have a more relaxing nap time.