Get the best ergonomic baby crib online! Our standard lying height at top of the mattress is 27” (68.5 cm). This height is ergonomically suitable for females of average height which is statistically considered to be between 5’ 3.8” to 5’ 6” in USA. For more information, you can call us at 1 (80 574-7880. Follow us: https://liftsmartcrib.com/product-specs