4 months old baby is best not to support standing, 4 months old baby skeletal development is not mature, if premature standing will lead to lower limb bones deformed state, may form X-leg or O-leg, is not conducive to the growth of the lower limb bones, while premature standing for the spine is also unfavorable, so it is best not to support standing. 4 months old baby is normal to roll over, lift the head, promote limb movement behavior is the main, you can The 4 months old baby in daily life pay attention to feeding at the same time, pay attention to vitamin D and trace elements calcium elements appropriate supplementation, conducive to the baby’s growth and development.