A twin mattress is the most common size for kids moving out of a toddler bed. It works well through the early school years. A full mattress is a better long-term investment for older kids or anyone who wants more room. For taller teens, a twin XL adds extra length without taking up as much space as a full.

A medium-firm mattress is generally the best starting point for children because it supports healthy spinal alignment and is comfortable for back and side sleeping positions. Avoid very soft mattresses for young children because they may not provide enough support for growing bodies.

Yes. Sam's Club carries kids mattresses from trusted mattress brands as well as the exclusive Member's Mark line, which offers high-quality construction at member-exclusive pricing. Members get free shipping on most orders and straightforward returns. Browse the full kids mattress collection at Sam's Club to compare sizes, types, and firmness levels.