The main reasons for leg cramps in late pregnancy are the following: a. Too much meat. If the mother consumes too much meat, it is easy to cause leg cramps, because meat contains relatively more protein, if too much intake can affect the metabolism of carbohydrates, leading to the accumulation of acidic metabolites, which causes electrolyte disorders and induces leg cramps. Second, fatigue. Fatigue caused by excessive exercise or excessive force in the legs during the day, the state of muscle tension at night is not improved, muscle tension is still not eliminated, too much acidic metabolites, such as lactic acid to stimulate the muscles, causing cramps. Third, cold. The calf muscles are susceptible to cold, and due to the stimulation of cold, the leg muscles can cramp due to spasm, mainly because the warmth is not done. Fourth, hypocalcemia. The demand for calcium in late pregnancy is relatively high, and if calcium is not replenished in time, it is very easy to cause calcium deficiency and lead to calf cramps. Five, the posture of sleep. If you lie on your back for a long time, so that the quilt is pressed against your feet or lie prone for a long time, so that your feet are against the bed, forcing certain muscles of the calf to be in a state of absolute relaxation for a long time, it is also easy to cause leg cramps. Six, sleep too long. Sleeping too long can cause blood circulation to slow down, so that carbon dioxide and other metabolic waste buildup, sometimes also induce leg cramps.