Hello, congenital malformation of thumb can be treated surgically. Generally 1.5 years old is more suitable for treatment, but the photos you sent are really unclear. So, please upload some clear photos, and I will contact you when I see them.

Liu Yuanbo, Limb Plastic Reconstruction Center, Plastic Surgery Hospital, China Academy of Medical Sciences.

(Dr. Liu solemnly reminds me that because I can't see the patient face to face, I can't fully understand the condition. The above suggestions are for reference only. Please go to the hospital for specific diagnosis and treatment under the guidance of a doctor! )

Liu ba da Chu plastic hospital