After delivery, during the breastfeeding period is relatively easy to cause calcium deficiency, so women in the breastfeeding period should pay attention to replenish sufficient calcium elements. How can we determine the manifestation of calcium deficiency in breastfeeding women, there are mainly the following aspects: first, feel weak, sometimes in the early stage of calcium deficiency will cause obvious weakness, weakness, feel sore and weak limbs. If these manifestations are present, calcium supplementation, including medication and food, should be increased appropriately. Secondly, feeling soreness and pain in the back and knees, especially the lumbar spine feels pain after activity, or the knee joint shows significant pain. In this case, it is sometimes the corresponding symptoms caused in the early stage of calcium deficiency. Third, it is easy to have muscle spasms in the lower limbs at night when sleeping and cold, which are manifested as leg and foot cramps and numbness in the feet, and these are more obvious clinical manifestations of calcium deficiency caused by muscle spasms in the lower limbs. Fourth, there will be dizziness and similar symptoms to anemia, and at the same time, it indicates a significant decrease in milk production. If the above-mentioned manifestations occur, the mother should promptly take calcium supplements to avoid affecting the growth and development of the child’s bones and nervous system due to her own calcium deficiency.