This is an abnormal phenomenon, especially for children after 6 months of age, and must be taken seriously and corrected. This can be corrected by the following methods: 1. Massage the thumb. Parents hold the child’s wrist with one hand and massage the thumb in the direction of extension with the other hand. 2. During nighttime sleep, wrap a handkerchief around the root of the thumb to help separate the thumb from the palm, and tie a knot on the other side of the wrist to prevent the thumb from tucking in.