Crying in March babies may be caused by hunger, fecal irritation, colic, calcium deficiency, indigestion and so on. 1. Hunger: three-month-old babies can’t talk yet, and if they are hungry, they will express their desire to eat by crying. 2. Excretory stimulation: may be urine or stool, excretory stimulation, feel uncomfortable, so crying, you can check the diaper. 3. Colic: March babies are highly prone to colic, which may be caused by inhaling too much air during breastfeeding, so they are prone to crying. 4. Calcium deficiency: Calcium deficiency in infants can cause increased nerve excitability, which can lead to crying, accompanied by occipital baldness, excessive sweating, and sleeplessness at night. 5. Indigestion: March babies are weak in digestion and absorption, and frequent overfeeding can easily cause indigestion, leading to abdominal distension, abdominal pain, and therefore crying. Excluding physiological factors, it is recommended to take the baby to the doctor to find out the cause and then give treatment.