Vitabiotics Wellbaby Vitamin D Drops 30ml Ideal strength Vitamin D drops.Wellbaby Vit D Drops has been carefully developed by Vitabiotics’ nutritional experts, and provides 10mcg of vitamin D for infants and young children, as recommended by the UK Department of Health**, in a natural olive oil base.**A daily supplement of 8.5-10Âµg vitamin D is recommended for babies from birth to 1 year of age, unless they are drinking 500ml (approx. 1 pint) or more of infant formula a day, as infant formula has vitamins added to it. Children aged 1-4 years should be given a daily supplement containing 10Âµg vitamin D. Source: NHS Choices.Vitamin D is needed for normal growth and development of bone in children. It also contributes to their normal immune system function.