Our shirts do not come with a replacement button however we are happy to send you one if needed. We believe it is less wasteful to send out spare buttons with all of our shirts, especially since our buttons are well sewn on and don’t fall off very often. If one of your items loses a button, please email us on info@thesleepshirt.com and give us the following information: the name of the item you purchased or a photo of it and your shipping address. If you can, include your order number but if you purchased your The Sleep Shirt item elsewhere, then this is not needed. We will then send you a replacement button in the mail.