The smart performance of 5-month-old babies is reflected in gross motor, fine motor, language, social behavior and other aspects. 1. large motor: large motor development progress is relatively fast, the baby can lift the head very steadily, and free, free rotation, turn over from the left side to the right side, can be turned from supine to side, and then can be turned back. The child can start to learn to sit, put on a chair with a backrest, and be able to sit for a few moments with his back straight. 2. Fine Motor: Grasping toys close by, the baby will be interested in colorful toys, such as red balls, colorful blocks, etc., and can use both hands to put toys into the mouth for exploration. 3. Language: vocalizes to people and objects, can produce monosyllabic letters. 4. Social behavior: excited by food, babies also like to play with other babies of the same age and establish social relationships. 5 months baby smart performance and later growth has a certain relationship, as long as the baby development are normal, parents do not need to pay too much attention to these. Take your baby for regular medical checkups.