Table 1.

Different guidelines for vitamin D supplementation [14]

First Author & year	Title	Type	Vitamin D S Status cut-off Values considered	Vitamin D Toxicity level considered	Population	Vitamin D supplementation
Munns et al. 2016 [15]	Global Consensus Recommendations on prevention and management of nutritional rickets	Consensus statement from expert members of various international societies	Sufficiency, > 50 nmoI/L Insufficiency,30–50 nmoI/L Deficiency, < 30nmoI/L	> 250nmoI/L, with hypercalcemia, hypercalciuria, and suppressed PTH	Children And adults	Infants (0–12 months) 400 IU/day in the first year of life, Independent of their mode of feeding. Beyond 12 months of age 600 up to 2000IU/day (Minimum duration 12 weeks pregnant women 600 IU/d throughout pregnancy
Braegger et al., 2013 [16]	Vitamin D in the healthy European pediatric population	Consensus Statement from members of the ESPHGAN Committee of nutrition	Sufficiency > 50 nmoI/L Severe deficiency < 25 nmoI/L	No agreement on a vitamin D toxicity threshold”	Children	Infants (birth to 12 months) 400IU/day in the first year of life Beyond 12 months: > 600IU/day In children from identified risk groups
Saggese et al. 2018 [17]	Vitamin D in pediatric age: consensus of the Italian Pediatric Society and the Italian society of preventive and social paediatrics jointly with the Italian federation of pediatricians	Consensus Statement From national Pediatric societies in Italy	Sufficiency > 30 ng/ml (> 75 nmoI/L) Insufficiency 20-29ng/ml (50–74 nmoI /L) Deficiency < 20ng/ ml (< 50nmoI/L) Severe deficiency < 10ng/ml (< 25nmoI/L)	Not Reported	Children	preterm infants: weight > 1500 g: 400-800IU/day, Weight < 1500 g. : 200-400IU/day by enteral feeding 400IU/day in all newborn independent of the type of feeding subjects beyond 12 months of age: 600up to 1000 IU/day in children and adolescents with risk factor for Vitamin D deficiency.

ESPGHAN (European society of pediatric gastroenterology, nutrition and hepatology)