4 months baby can be held vertically, but need to protect the head, neck, chest and back, do not long time vertical hold. Generally speaking, at 4 months the baby’s spine develops a cervical anterior convexity, which can support the baby to raise his head, the baby is also very curious about the surrounding environment at this time, the vertical hold can allow the baby to have a more open range of vision, to meet the baby’s curiosity, the vertical hold baby can also be convenient to communicate with the family. However, due to the curvature below the cervical spine has not yet developed, 4-month-old babies can not sit, so when you hold the baby, you need to protect the baby’s head, neck and chest and back, to prevent the vertical hold is not stable, the baby tipped over. It should be noted that 4-month-old babies can not be held vertically for a long time, because the development of the baby’s spine is not yet perfect, parents need to change the position often when holding the baby to avoid maintaining the same position for too long.