Looking for some guidance on shopping for girls and boys bed sheets? We’ve got you covered. Q: What’s the difference between twin-sized and twin XL-sized sheets? A: Twin XL-sized sheets are longer, and typically fit dorm room mattresses. If you’re not sure what size your mattress is, measure before purchasing. Q: Should I buy more than one set of bed sheets? A: Our experts recommend getting more than one set - but make sure both sets coordinate. That way, if one piece of bedding gets soiled, you can just temporarily swap out one sheet instead of the entire set (a huge timesaver for parents!). Or, you can just mix and match for fun. Q: How often should I launder my kids bed sheets? A: Weekly is optimal, or more as needed. (We know kids can be messy sometimes.)