Miki House This item has been hardly used because it's for a house with whole-house air conditioning. There is no size listed. Looking at the website, it seems to be one size only, so I think it can be worn from newborns to around 3 years old. Please consider this as a reference, as there may be individual differences. A baby sleepwear with a colorful bear design made of soft fleece material. - Design: Colorful print of a bear's face - Material: Soft fleece material - Features: Easy to put on and take off with buttons - Color: Colorful design with a beige base Thank you for viewing.