A textbook of obstetrics . r cent, in the mother. At thirty-six toforty-eight hours after birth the percentage of hemoglobin ishighest, and then begins to The ordinary jaundiceof the new-born infant is due to the superabundance of red blood-corpuscles which are destroyed in the liver, giving rise to anexcess of bile-pigment. It is reasonable to suppose that it mayalso be in part hematogenic, the destruction of the red blood-corpuscles setting free a certain amount of coloring matter inthe blood, which is directly absorbed by the tissue. 1 Cattaneo, Diss. Inaug., Basel, 1892. 792 THE
A textbook of obstetrics . r cent, in the mother. At thirty-six toforty-eight hours after birth the percentage of hemoglobin ishighest, and then begins to The ordinary jaundiceof the new-born infant is due to the superabundance of red blood-corpuscles which are destroyed in the liver, giving rise to anexcess of bile-pigment. It is reasonable to suppose that it mayalso be in part hematogenic, the destruction of the red blood-corpuscles setting free a certain amount of coloring matter inthe blood, which is directly absorbed by the tissue. 1 Cattaneo, Diss. Inaug., Basel, 1892. 792 THE A 7: W-BORN IAFAXT. The heart exhibits a transition from the fetal to the infantilecirculation by the closure of the foramen ovale, the obliterationof the ductus arteriosus, and the disappearance of the Eustachianvalve ( Figs. 595, 59^)- The umbilical cord, after twenty-four hours, shows a line ofdemarcation at its base. There is then a necrosis of the amnioticcovering, a mummification of the mucous tissue, and a destruc-. Fig. 596.—The circulation in the mature fetus before birth. tion of its vessels. The cord drops off about the fourth daw Itsdetachment is followed by the retraction of the granulatingstump within the umbilical ring. Abnormalities in the Physiology of Premature Infants.—The two main deviations are low temperature—variations below980—and inability to ingest and digest food. The management f premature infants consists in incubationand gavage. In the absence of a specially constructed incubator, PHYSIOLOGY OF THE NEW-BORN INFANT. 93 such as Tarniers or Auvards, one can be readily improvised with an ordinary infants bath-tub, several layers of cotton-woolor lambs wool, and a number of bottles filled with hot is the regular feeding of the infant with freshly drawn
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