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A Serta twin size mattress is a popular choice for children. At 38" by 75", a twin mattress fits well into any bedroom while still allowing your child enough room to sleep comfortably, and the mattress's smaller size makes it an affordable option. Serta twin mattresses are perfect for your child's bedroom. Serta has been named America's Most Recommended Mattress by the Women's Choice Award for three years running, so you can trust that your child will sleep well.