Colostrum usually lasts for 3-5 days, usually not more than 7 days, with some individual differences. The milk secreted within 7 days after delivery is called colostrum, which is yellowish in color and thicker in texture, and contains more proteins and secretory IgA, which can enhance the baby’s immunity and prevent the baby from being infected by external bacteria and viruses. In addition, colostrum contains little fat and sugar, which is easy to digest and absorb, and has the effect of diarrhea meconium, which is the most ideal food for newborns in the early stage. Generally, after 1 week, the amount of maternal milk will gradually increase, and can be changed from colostrum to white mature milk. The protein content in mature milk will gradually decrease, while the fat and lactose content will gradually increase. In addition, colostrum is very valuable. Even if you do not plan to breastfeed, make sure your baby eats colostrum to strengthen the baby’s resistance.