1. Physical growth and development: Within 7 months after birth, the baby\’s body grows rapidly and the weight increases significantly. Under normal circumstances, the baby\’s weight will increase by about 1.5 times, and the length will also increase by more than 10 cm. In addition, the baby\’s head circumference, chest circumference and other indicators will also increase. 2. Development of motor ability: At 7 months old, the baby\’s motor ability has also been greatly improved. At this time, most babies can already sit up independently and can crawl, roll and other activities.