Terms and Definitions Sex and Sexual Identity Sex is multifaceted, with at least 9 components: chromosomal sex, gonadal sex, fetal hormonal sex (prenatal hormones produced by the gonads), internal morphologic sex (internal genitalia), external morphologic sex (external genitalia), hypothalamic sex…
See also Part XV and Chapters 577 and 578 . During the preteen, teenage, and young adult years, young people undergo not only dramatic changes in physical appearance, but also rapid changes in physiologic, psychological, and social functioning. Hormonally driven…
Infections are a frequent and important cause of neonatal morbidity and mortality. Congenital or intrauterine infections (i.e., those transmitted across the placenta) and perinatal infections (i.e., those transmitted from the mother to the fetus or newborn infant during the birth…
Premature and very-low-birthweight (VLBW) infants often have prolonged hospitalizations and are particularly prone to healthcare-acquired infection ( HAI ) because of their inefficient innate immunity, deficient skin barriers, presence of indwelling catheters and other devices, and prolonged endotracheal intubation (…
Infections in the newborn are often classified by their timing relative to birth and include congenital, perinatal, early-onset, and late-onset disease. These are clinically useful designations because the mechanisms of infection, etiologies, and outcomes are distinct at each stage. Congenital…
Dysmorphology is the study of differences in human form and the mechanisms that cause them. It has been estimated that 1 in 40 newborns, or 2.5%, have a recognizable birth defect or pattern of malformations at birth; approximately half these…
Endocrine emergencies in the newborn period are uncommon, but prompt identification and proper treatment are vital to reduce morbidity and mortality. Pituitary dwarfism (growth hormone deficiency) is not usually apparent at birth, although male infants with panhypopituitarism may have neonatal…
Neonatal Abstinence (Withdrawal) Scott L. Wexelblatt Keywords benzodiazepine buprenorphine cocaine MAT medication-assisted treatment methadone methamphetamine NAS neonatal abstinence syndrome opioid phenobarbital Neonatal abstinence syndrome (NAS) is the clinical diagnosis given to infants who experience withdrawal signs after in utero exposure to…
Umbilical Cord The umbilical cord typically consists of 2 umbilical arteries, the umbilical vein, and a gelatinous substance called Wharton's jelly, all contained within a sheath derived from the amnion and coiled into a helical shape. The muscular umbilical arteries…
Anemia in the Newborn Infant Patrick T. McGann Russell E. Ware Keywords ABO incompatibility anemia of prematurity fetomaternal hemorrhage G6PD deficiency hereditary spherocytosis physiologic nadir Anemia is a common laboratory and clinical finding in the newborn period and carries a broad differential…