**6. Conclusion**

Nutrition is important before and after pregnancy as well as during pregnancy. The intake of macro and micro nutrient items affecting maternal and fetal health problems positively during pregnancy. Vitamin A plays a fundamental role in retinoid metabolism and visual functions, cellular differentiation related to embryonic development, lung maturation and immune system development of fetus. Vitamin D regulates calcium and phosphorus metabolism together with parathyroid hormone and calcitonin. It increases calcium reabsorption and decreasing calcium excretion by playing a role in maintaining bone balance. It also has effects on the nervous system, heart and blood clotting mechanism. Vitamin E is important and the main finding of Vitamin E deficiency, is hemolytic anemia. However, in addition, muscle and nervous system disorders and muscle fatigue can also be seen with

*The Effects of Multivitamin Use in Pregnancy on Mother and Fetus Health DOI: http://dx.doi.org/10.5772/intechopen.98925*

its deficiency**.** The most important function of vitamin K is anticoagulation; If vitamin K is not given to the baby at birth, disorders in the coagulation mechanism may occur. Therefore, for prophylaxis, intramuscular administration of vitamin K immediately after delivery is recommended. Vitamin K has also an important effect on bone health. Vitamin B₆ is used as an alternative treatment to prevent nausea and vomiting during pregnancy. At the same time, vitamin B₆ is of interest because of the preservation of the placental vascular bed. Folic acid works in conjunction with vitamin B12 to form hemoglobin in erythrocytes. Deficiency leads to NTD in newborn. Vitamin B12 deficiency result with megaloblastic anemia, congenital anomalies and problems in the nervous system of the fetus. Increased calcium intake during pregnancy is important for the health of mother and baby. During this period, the use of calcium supplements reduces preeclampsia. Ca is necessary for dental health. On the other hand, Iron deficiency or excess is one of the most common diseases in humans. Pregnant and lactating women are in the risk group for iodine deficiency. The most important cause of correctable mental retardation of newborn is iodine deficiency.
