Reduced primary care respiratory infection visits following pregnancy and infancy vitamin D supplementation: a randomised controlled trial.  Grant et al., 2015 [163]  New Zealand  Healthy pregnant women and their infants up to 6 months of age  Standard daily dose (1000 IU/400 IU) vs. high dose (2000 IU/800 IU)  Less primary care visits for ARI up to age 18 months.