Not Medical Advice: It's called colostrum, the first milk your bréasts produce during pregnancy.
When you feed your baby colostrum, which may appear as clear fluid or be a deep golden color, it's as though you're giving him his first vaccination. It contains immunoglobulins, which are antibodies passed from mother to baby in order to provide the baby with what is called passive immunity.
As per Pregnancycorner.com, colostrum is rich in proteins, Vitamin A, and sodium chloride, and contains lower amounts of carbohydrates, lipids, and potassium than normal milk does.
A newborn's feeding schedule can be unpredictable. Here's what, when and how to feed your baby shared by Mayoclinic.org.