Hat size: crochet baby hat and glove suits for 1 month to 18 months baby girl boy; head circumference: M: 2-6 months. We recommend you measure your baby's head circumference to choose a suitable size. If your baby's head circumference is slightly large, you can choose a larger size. Safety: your newborn hats use green raw materials, formaldehyde-free and azo-free dyes, no harsh chemicals against the baby's thinner skin. Cute design: super cute hat keeps the head and ears nice and warm. You can give this hat as a Christmas or birthday gift for your daughter, son or granddaughter or grandchildren. It is also a great gift for babies. Recommended washing method: after 1-2 minutes, wash with your hands. NOTE 1. The size of the product is measured manually, and there will be an error of 2-3mm due to factors such as different measurement tools and measurement methods. 2. This product is all taken in kind, but due to differences in photography, lighting, color deviation, and personal understanding of color. As a result, there may be some color difference between the actual product and the photo, and the color is subject to the actual product. 3. Please take good care of our products~ 4. Please confirm the size before purchasing