Five-month-old baby always wakes up at night, the common reasons are children eat too much night milk, vitamin D deficiency or trace element calcium deficiency, daytime fright, etc., as follows: the first kind, too much night milk: parents give their babies too much night milk before going to bed, resulting in frequent nighttime urination or defecation, etc., will affect the baby’s sleep, so they will always wake up. The second, vitamin D deficiency or trace element calcium deficiency: common cause because of vitamin D deficiency, trace element calcium deficiency, resulting in the baby will appear night terrors, easy to wake up phenomenon, you can for vitamin D, calcium reasonable examination, according to the actual situation to give adjustment. Daily life to increase the sunlight sunshine, can help the skin synthesis of vitamin D, effective absorption of vitamin D, conducive to the absorption of calcium in the body. The third, daytime fright: common cause is because the baby’s nervous system is not very well developed, daytime if frightened and other factors, there will be a night sleep always wake up situation occurs. So, specifically when the baby appears to always wake up, you need to give adjustments according to the actual situation.