Facial muscular dystrophy
During the baby's growth, facial muscles will gradually develop and strengthen. In the early stage of development, the symmetry of facial muscles may be affected, resulting in a crooked mouth when laughing. This is usually a normal physiological phenomenon and will disappear naturally with the passage of time.
Disharmony of cranial nerve control
The baby's smile is controlled by the brain nerve. During the development period, the coordination ability of brain nerves may not be fully developed, which leads to the baby's mouth askew when laughing. As the nervous system matures, the baby's smile will gradually become symmetrical.
Temporary factor influence
Sometimes, when the baby laughs, due to other temporary factors, such as the baby's uncomfortable posture or facial muscle fatigue, the mouth will be skewed. This situation is usually short-lived, so don't worry too much.
Pay attention to abnormal performance
It should be noted that if the baby's mouth is always skewed and accompanied by other abnormal manifestations, such as breathing problems, difficulty sucking or facial muscle relaxation, it is recommended to consult a pediatrician to eliminate any potential problems. Otherwise, for most babies, it is normal and temporary for their mouths to be askew when laughing, so don't worry too much.