Is “inward thumb” a disease or not? ”Ingrown thumb” is a condition in which the baby’s thumb is held in the palm of the hand, often accompanied by a clenched fist. Many parents will rush to the cerebral palsy clinic after seeing their baby’s thumb inward, but I believe most parents will be confused whether the thumb inward is a disease or not. It is true that “thumb inversion” is an early symptom of cerebral palsy, but we also need to distinguish it from physiological thumb inversion to avoid unnecessary worries. From birth to 2 months of age, the muscles of the limb joints are often flexed due to physiological flexion, which is one of the manifestations of physiological flexion and is normal. If your child is still prone to clenching his or her fist by 3-4 months of age and has a pronounced inward thumb, this is a pathological condition that is indicative of increased muscle tone and requires a visit to a neurological rehabilitation clinic. What are the risks of thumb inversion? First of all, thumb inversion with fist clenching will affect the child’s awareness of grasping objects, prevent the acquisition of sensations such as touch, so that the child’s perceptual exploration of the outside world is hindered. The above 2 months of age refers to full-term infants, while preterm infants may have different degrees of delay depending on the month of prematurity. Now you have a basic understanding of the inward thumb. If it is a physiological phenomenon as described above, mothers can put down their worries, but if it is a pathological inward thumb, parents must seek medical attention in time to exclude brain injury or cerebral palsy and other diseases and obtain early diagnosis and treatment.