Baby is getting a big girl bed. Went with this premium mattress from Saatva. On sale currently. High-density foam. It’s double-sided, with one side suitable for children from 3 to 7, and the other side best for kids 8 to 12 years old. A water-resistant finish and internal waterproof barrier. Naturally hypoallergenic and antimicrobial organic cotton, nontoxic natural thistle flame barrier, and CertiPUR-US® certified foams LTKkids LTKfamily LTKsalealert