27.5" x 52" x 5"Our award-winning Little Dreamer is highly revered and highly rated by mattress professionals, industry leaders and parents alike. This 5” dual-sided top seller supports both newborns and toddlers with a high-density infant foam side and corresponding plush foam toddler side. Simply switch the mattress when your little one is ready for the next step, using the arrows on the mattress tag as a guide.