Why newborns get jaundice after birth

Neonatal jaundice is a very common disease in newborns, with 60% of full-term babies developing jaundice within the first week of birth, and 80% of babiesprematureJaundice develops within 24 hours of birth.Before birth, the fetus grows in the mother's womb, which is a low-oxygen environment relative to the atmosphere. As in people living in highlands, there is an increase in red blood cells to increase the amount of oxygen in the blood. After birth, the baby begins to exchange gases with the atmosphere through the lungs. As oxygen increases, a large number of red blood cells become redundant, and the body decays to form bilirubin, a substance that causes jaundice. Hence the yellowing of the skin. Pediatric jaundice Neonatal jaundice distinction 1, neonatal physiological jaundice: neonatal jaundice begins to appear 2-3 days after birth, the most obvious after 4-5 days, 7-14 days of natural regression, the general condition is good, no adverse reactions, called "physiological jaundice".prematureBecause liver function is more immature, jaundice appears later, probably on day 3 or 4, and lasts longer, lasting 14 days or more in preterm infants. 2. Neonatal breast milk jaundice: jaundice starts 4-7 days after birth and lasts for about 2 months, mainly with elevated non-conjugated bilirubin, and no clinical symptoms. 3. Pathological jaundice of neonates: jaundice appears early, and jaundice appears within 24 hours after birth. Jaundice is persistent and persists or even deepens after 2 to 3 weeks of age, or decreases and then deepens. The jaundice is severe, golden yellow or jaundice all over the body, and there is also obvious jaundice in the palms and soles of the feet or serum bilirubin is greater than 12-15 mg/L. Those with anemia or pale stool color. Those with abnormal body temperature, poor appetite, vomiting and other manifestations. Reminder: If the baby is general physiological jaundice, mothers do not have to worry, jaundice is easy to fade, but if it is pathological jaundice, it is best for the mother to take the baby to the hospital for treatment as soon as possible, do not delay the baby's treatment time! Typically, the normal value for jaundice in full-term newborns is 12.9 mg/100 ml, which means that the blood bilirubin level in 100 ml is less than 12.9 mg. The normal value for jaundice in preterm infants is 15 mg per 100 ml of blood, which means that the bilirubin level in 100 ml of blood is less than 15 mg. When the baby's jaundice value exceeds 12.9 mg/dl, or the neonatal jaundice index rises too quickly (more than 5 mh/dl per day), or the jaundice lasts longer than the full-term infant and resolves within 14 days, the preterm infant resolves within 4 weeks, or the jaundice resides. It means that the neonatal jaundice is unhealthy and may have pathological jaundice. Can we tell if the baby has jaundiceCan we tell if the baby has jaundiceThe level of jaundice in the blood cannot be judged only by the degree of yellowness of the skin observed by the naked eye, because there is a difference in skin color, and at the same time under different lights. To determine whether the level of jaundice in newborns is normal, it must be judged by a professionally trained pediatrician who takes into account many factors. There are differences between people of different races and skin colors, and the proportion of jaundice in newborns in China is about 50% for full-term infants and about 80% for premature infants. The level of jaundice that can be observed with the naked eye is about 5-8 micrograms per dL, below which paternalism cannot be observed by the naked eye. Therefore, neonatal jaundice values must be obtained by measuring bilirubin.