Vitamin AD is actually cod liver oil, which is to promote calcium absorption, thus reducing and avoiding the occurrence of pediatric rickets. Cod liver oil can actually be taken at any time of the day. If at the same time your baby needs calcium, it’s best to take the vitamin AD drops in the morning or afternoon, and it’s better to take the calcium in the evening. This is because babies eat less at night than they do during the day, which is the best time to take calcium supplements and may promote calcium absorption. And cod liver oil and calcium are generally not recommended to be taken at the same time, at least 2 hours apart, so it is generally recommended to take vitamin AD good during the day, but taking vitamin AD is generally not recommended for long-term use. The daily dosage should listen to the doctor’s medical advice, is it a preventive or therapeutic amount? After 2 months of taking it, you need to check further whether to continue taking it so that it can be better.