Vitamin D3 has the effect of preventing pediatric rickets and is taken starting half a month after the baby is born. To give your baby vitamin D3, it is generally recommended to take it in the morning, because vitamin D3 can promote the absorption of calcium, which can help your baby’s bones to grow and develop better, and after taking it in the morning during the day can allow your baby to absorb calcium better. Give your baby calcium products to be taken in the afternoon or evening, so that calcium can stay in the intestine for the longest time, the digestive system has more time to absorb, can improve the absorption rate of calcium.