Four and a half month old babies generally commonly used training visual training, auditory training, muscle function training, hand-eye coordination training and so on. 1. Visual training: such as the four and a half month baby to see the image of rich drawings, brightly colored toys to attract the baby’s attention. 2. Auditory training: four and a half months this stage of the baby began to learn to speak, parents are advised to give the baby more talk, especially imitation of the baby to speak, to give rich language stimulation, although the baby can not give clear feedback, but for the baby’s hearing and language development have certain benefits. You can also play some gentle, pleasant music for your baby. 3. Muscle function training: for four and a half months of this stage of the baby can be rolled over, side lying, head up and other movements of the training, which will help the spine, waist and other muscle exercise. Exercise should pay attention to the time should not be too long, the action should not be too fierce. 4. Hand-eye coordination training: baby lying down, parents can take some brightly colored toys to the baby in front of the baby, through the sound, bright colors and so on to tease the baby. Let the baby with the movement of toys to find toys, and try to hold toys. If necessary, seek help from a child health care provider.