Secondary outcomes
Pneumonia, bronchiolitis
PNEUMONIA, BRONCHIOLITIS
Pneumonia, bronchiolitis and OM (incidence) will be analysed as specific ARI subgroups (Circulating 25OHD concentrations are measured in maternal blood at baseline (≤34The prevalence of nasal pathogens will be determined via nasal swabs, collected from infants at ages 4 and 12 months. Swabs will be screened for key respiratory bacteria (