Yes, it is recommended to supplement your baby with vitamin D, even if you are breastfeeding, as breast milk does not provide sufficient vitamin D. Although breast milk is a source of vitamin D, it does not contain enough to cover the daily needs of an infant, especially if the baby is exclusively breastfed. Exclusively breastfed babies receive less than 20% of the recommended daily intake of vitamin D during their first year of life. A daily vitamin D supplement for the mother, ranging from 400 to 2,000 IU (i.e. 10 to 50 µg), produces concentrations in breast milk that are insufficient to meet the daily needs of an exclusively breastfed infant or to correct a potential vitamin D deficiency in the baby. Therefore, even if the mother is taking vitamin D supplements within this dosage range, it is recommended to give the infant a daily supplement of at least 400 IU (10 µg) to meet paediatric recommendations. You can give your baby 3 drops of our Sunny Baby vitamin D per day — that is 400 IU (equivalent to 10 µg) — directly into the mouth or diluted in a glass of water. It is important to follow the dosage carefully to avoid any risk of overdose. For any specific questions or dose adjustments, it is best to consult your doctor.