It is a natural physiological phenomenon for babies to suck their fingers. Designed specifically for babies aged 0-3 years old, it uses safe and hygienic soft glue to allow babies to safely spend time biting their fingers. This toy can replace this behavior of babies and make babies happier. This product is made of non-toxic food-grade ECO materials , made using ultrasonic technology and does not contain any harmful substances such as glue. The product can be boiled and sterilized. It is recommended that the boiling time should not exceed 2 minutes each time to make your baby's toys more hygienic.