Low prenatal vitamin D should be of general concern to paediatricians everywhere. Not only is hypovitaminosis D common in the general community, but there is also growing concern about the high prevalence of hypovitaminosis D in pregnant women. Low levels of this vitamin have been shown to increase the risk for various disorders that emerge later in childhood or during adulthood. It is well known that low levels of vitamin D are associated with abnormal bone growth, presumably because of impairments in calcium and phosphate homeostasis. Some of these effects are long-lasting, for instance, low prenatal 25 hydroxyvitamin D3, (25OHD3), is associated with reduced bone mass at the age 9. Epidemiological studies have also suggested that low levels of maternal vitamin D at birth may also increase the risk of autoimmune disorders such as diabetes and multiple sclerosis in later life. Low levels of vitamin D during foetal development may even be associated with an increased later risk of neuropsychiatric disorders such as autism and schizophrenia.