Due to a necessary change of habits (less outdoor activity or outdoor activity fully clothed and the use of sun screen), mothers are not able to synthesize sufficient vitamin D and so meet the baby´s requirements. As a result, it is necessary that infants under one year of age take 400 UI/d of vitamin D per day
The production of vitamin K is low and the amount obtained via breast milk is variable. In order to prevent haemorrhagic disease of the newborn (HDN), vitamin k should be given to babies just after birth.
Vegetarian mothers should take vitamin B12 supplements. If the mother does not take the supplements it will be necessary to supplement the child in order to combat serious problems that Vitamin B12 deficit may cause.