Please ensure you select the correct size when placing your order. If you are unsure of your size, please email us or SIZE UP. Due to a high volume of orders, we are unable to change your size after your order has been placed.

If you have any additional questions or comments concerning Onesie sizing, please reach out to us at onesienationusa@gmail.com. We will do our best to assist you and find a comfortable sizing based on your information!