Vitamin D status of exclusively breastfed infants aged 2–3 months
- 1Discipline of Nutrition, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
- 2Department of Paediatrics: Child and Youth Health, University of Auckland, Auckland, New Zealand
- 3Department of General Paediatrics, Starship Children's Hospital, Auckland District Health Board, Auckland, New Zealand
- Correspondence to Dr Clare Rosemary Wall, Discipline of Nutrition, Faculty of Medical and Health Sciences, The University of Auckland, 85 Park Road, Grafton, Auckland 1142, New Zealand;
- Received 13 May 2012
- Revised 2 December 2012
- Accepted 4 December 2012
- Published Online First 8 January 2013
Background New Zealand in 2008 adopted WHO policy which recommends that all infants are exclusively breast fed until 6 months of age. The benefits of this policy for the infant are undisputed; however, this policy has the potential to adversely impact on infant vitamin D status. A number of countries now recommend that all breastfed infants receive daily vitamin D supplementation of 400 IU to prevent rickets. New Zealand has no policy on the vitamin D supplementation of ‘low-risk’ breastfed infants. There are no data on the vitamin D status of exclusively breastfed infants in the first few months of life in New Zealand.
Aim To describe serum 25-hydroxy-vitamin D (25(OH)D) concentrations in exclusively breastfed infants aged 2–3 months.
Design/methods Healthy term exclusively breastfed infants who were receiving no vitamin D supplements were enrolled over a 15-month period. A capillary blood sample was obtained from each infant. Serum 25(OH)D was measured using isotope-dilution liquid chromatography–tandem mass spectrometry.
Results 94 infants were enrolled (mean age 10 weeks). Median 25(OH)D concentration was 53 nmol/l (IQR 14–100 nmol/l). 23 (24%) infants had serum 25(OH)D concentration <27.5 nmol/l. Infants enrolled during winter had a median (IQR) 25(OH)D serum concentration of 21 nmol/l (14,31). Infants enrolled during summer had a median (IQR) 25(OH)D concentration of 75 nmol/l (55 100) (winter vs summer, p<0.0001).
Conclusions Vitamin D deficiency is prevalent in exclusively breastfed infants in New Zealand. Vitamin D supplementation should be considered as part of New Zealand's child health policy.