Babies can be held vertically for more than 3 months, which is conducive to the communication between babies and the external environment, but the time should not be too long. In general, infants can be held vertically when they are 1 month old, mainly to help them digest and burp. 3 months of age, the main reason is that infants at this time are very curious about their surroundings, and holding them vertically allows them to have a wider field of vision, creates a good environment for them to communicate, and recognize their family members, etc. It is important to note that the spine has not yet developed the physiological curvature that can support them to lift their head and crawl. It is important to note that the spine of infants at this time has not yet developed the physiological curvature that can support them to lift their head and crawl. Therefore, it is important not to hold the infant too long every day, and to protect the infant’s head and waist when holding the infant upright to avoid the infant falling down.