Vitamin C and D levels in Arab women and their newborn infants have been sh
own to be low. We investigated the prevalence of and risk factors for possi
ble hypovitaminosis C and D in a convenience sample of 51 hospitalized chil
dren without clinical features of vitamin C or D deficiency. The mean age w
as 15.4 months. The serum vitamin C concentration was low in the mothers bu
t normal in the children. Both mothers and children had low serum 25-hydrox
yvitamin D (25-OHD) concentrations. Fifty per cent of the mothers and 22% o
f the infants and children had hypovitaminosis D (serum 25-OHD level <25 nm
ol/l). Infants who received dietary vitamin D supplementation had a higher
mean (SD) serum 25-OHD concentration than the unsupplemented group (62.5 (2
9.8) vs 38.5 (27.3), p=001). Cutaneous light exposure in these children was
poor. The children's serum 25-OHD concentration correlated with dietary vi
tamin D supplementation and maternal serum 25-OHD levels. The results sugge
st normal vitamin C status but a possible high prevalence of hypovitaminosi
s D in Arab children and their mothers in UAE. Health education to encourag
e greater sunshine exposure and improvement in maternal vitamin D stores an
d the availability of adequate vitamin D supplements would improve children
's vitamin D status. The study indicates that hypovitaminosis D continues t
o be an important maternal and child health problem, despite the abundant s
unshine.