1 month old baby crying is common in the following cases: 1, vitamin D deficiency rickets, mainly manifested as a state of nervous excitement, mostly seen in babies within 3 months of age with frequent crying, sweating, night terrors, night cries, square cranium and other symptoms, but also frequent breath-holding-like episodes, will improve after giving supplemental vitamin D and appropriate amount of outdoor activities, advocate breastfeeding. 2, brain injury syndrome, the baby’s limbs are not Increased voluntary movement, irritability, crying and restlessness, head easily tilted back, body jerking, hands clenched fist, and the presence of high-risk factors before, during or after birth, such as prematurity, low birth weight babies, hypoxic-ischemic encephalopathy, etc. If you have any of these manifestations and medical history, you should visit the hospital promptly.