A random-effect model was applied to combine the results of included essays. Methods: The international databases were used for a systematic search to identify relevant observational studies in English up to January 2021. The object of current study is to answer this question: is there any association between vitamin D status and undernutrition indices? The outcomes of vitamin D deficiency on undernutrition indices have stayed controversial. Micronutrients have pivotal effects on growth rate. Introduction: Undernutrition, defined as stunting, wasting, and underweight, still implicates millions of infants and children worldwide. 3Department of Pediatrics, Xiajin County People's Hospital, Dezhou, China.2Department of Pediatrics, Laoling People's Hospital, Laoling, China.

1Department of Pediatrics, Dezhou People's Hospital, Dezhou, China.Therefore, it is possible that even formula-fed young infants are vitamin D deficient.Chunhua Song 1, Hongzhi Sun 2, Ben Wang 1, Chunli Song 3 and Hongying Lu 1 * However, very young infants cannot take 1,000 mL of formula a day.

Formula-fed infants should ingest nearly 1,000 mL of formula for a vitamin D intake of 400 IU/day. All the infant formulas in Korea contain the minimum required vitamin D concentration of 40 IU/100 kcal (258 IU/L in a 20-kcal/oz formula). The authors overlooked the feeding amount of the formula. 1), 17.5% of the formula-fed infants were vitamin D deficient. The daily amount of formula feeding should be taken into consideration. Although an infant is formula fed, it cannot be automatically assumed that the infant is adequately supplied with vitamin D. This value is much lower than that in cow milk (204.400 IU/L) 9- 11). Whole human milk contains a vitamin D concentration of 15.26 IU/L, of which 12 IU is derived from the lipid fraction. The watersoluble fraction of cow's milk and human milk did not possess significant antirachitic activity. Human breast milk contains little vitamin D.

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