The investigators would like to test the hypothesis that maternal vitamin D supplementation during lactation in dose 1200IU/d (400IU from multivitamins + 800 IU cholecalciferol) is more effective than 400IU/d (400IU from multivitamins + placebo)to built appropriate maternal vitamin D status and could be beneficial for maternal and infants bone mineralization and body composition (proper proportion of muscle and fat tissues in body weight) and is safe for both. The investigators also want to confirm that vitamin D supplementation of exclusively breastfed infants in dose 400IU/d is adequate to build appropriate vitamin D status independently of mother's vitamin D supplementation up to 1200 ID/d. Additionally the investigators hypothesize that because of changes in lifestyle there will be no substantial seasonal differences in vitamin D status of pregnant women at the delivery and their newborn infants.
Sex
FEMALE
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
serum 25-hydroxyvitamin D concentration,
Timeframe: 3 time poits up to 6 months (0-3-6 months)