What causes a one-day-old newborn to spit up milk?
Oct 14, 2022
Source: Cainiu Health
Dr. Xie Zixing
Introduction
A one-day-old baby spitting up milk may be due to improper feeding, such as feeding too much milk or failing to burp the baby promptly after feeding, or the baby being overly hungry, feeding too quickly or urgently, and thus swallowing excessive air. It could also be caused by an immature digestive system, overfeeding, insufficient activity leading to indigestion, or the baby's own lactose intolerance.
A newborn baby spitting up milk one day after birth may be caused by improper feeding, indigestion, lactose intolerance, or other reasons.
1. Improper Feeding
A newborn's stomach is generally small and shallow. If caregivers feed the baby too much milk, fail to burp the baby promptly after feeding, or if the baby is overly hungry and feeds too quickly or eagerly—swallowing excessive air—spitting up commonly occurs.
2. Indigestion
One day after birth, a baby’s organs are still underdeveloped, gastrointestinal function is weak, digestive capacity is immature, and digestive enzyme activity is relatively low. Feeding too much milk at once or insufficient physical activity can easily lead to indigestion, resulting in spitting up.
3. Lactose Intolerance
If a newborn lacks sufficient lactase enzyme, consuming milk may trigger lactose intolerance, leading to spitting up along with symptoms such as bloating, diarrhea, and irritability.
After ruling out physiological factors, a newborn spitting up milk should be evaluated by a healthcare provider promptly to determine the underlying cause and receive appropriate medical treatment as directed.
