Thumb trigger finger in both hands of a three year old baby boy can be treated with surgery. Trigger finger in the thumb of a three year old baby is also known as congenital stenosing tenosynovitis of the flexor tendon of the thumb. It is caused by congenital thickening and narrowing of the tendon sheath, which compresses the flexor tendon. Conservative treatment for this disease is mostly unsatisfactory, and surgery is usually the treatment of choice. Surgery will incise and partially resect the thickened tendon sheath to relieve the pressure on the flexor tendon. After surgery, oral antibiotics such as amoxicillin will be given to prevent infection, and the thumb flexion and extension exercises will be strengthened to prevent adhesion. After treatment, most of them are able to get a good recovery, generally no sequelae. If a three-year-old baby boy has symptoms of stenosing tenosynovitis of the flexor tendon, it is recommended to go to the hospital in time for medical examination, complete the examination and receive regular treatment.