Cerebral palsy cannot be ruled out by the ability to laugh and smile at 2 months of age, but it depends on the later development or the usual daily behavior. In terms of neurodevelopment, the ability to laugh and smile is a good sign, but cerebral palsy cannot be ruled out only by laughing and smiling. It is also necessary to observe the baby’s physical development, posture maintenance and reaction. Common manifestations of cerebral palsy include persistently elevated muscle tone, i.e. stiffness, delayed motor development (inability to hold the head up in prone position at 3-4 months, inability to support weight on the forearms even after 4 months, and clenched fists in both hands), movement disorders, and unresponsive behavior (mental retardation, etc.). If you find that your child has any of the above symptoms or manifestations, you need to go to the hospital in time for early detection and treatment to avoid delays.