I would like to know if it is recommended to give vitamin D to an 18-month-old child during the winter season?

It is recommended to give 600 units of vitamin D per day to children aged 1 to 3 years old. This amount can easily be obtained through foods like cow's milk, soy milk, enriched orange juice, egg yolks, beef, pork, and fish. If your child drinks milk regularly, it is likely that they are already getting enough vitamin D from their diet and sun exposure. Unless your child does not consume milk, it is probably not necessary to give them a specific vitamin D supplement.