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Persistent pulmonary hypertension (PPHN) happens in newborn babies. It occurs when a newborn’s circulation continues to flow as it did while in the uterus. When this happens, too much blood flow bypasses the baby’s lungs. This is sometimes called persistent fetal circulation.

Small for gestational age is a term used to describe babies that are smaller than normal for the number of weeks of pregnancy. These babies have birth weight below the 10th percentile. This means they are smaller than many other babies of the same gestational age.

Transient tachypnea of the newborn is a breathing problem that affects babies during the first hours of life. Transient means it is short-lived. Tachypnea means fast breathing rate. The problem often goes away on its own in about 3 days.

Premature and low-birth-weight babies may be too immature to regulate their own temperature, even in a warm environment. Read on to learn how to safely keep them warm.

A biophysical profile is a test that is sometimes used during the third trimester of pregnancy. It is often done if there is a question about the baby’s health. This may be because of other test results or certain pregnancy symptoms, or because your pregnancy is high risk.

Neonatal abstinence syndrome is what happens when babies are exposed to drugs in the uterus before birth. Babies can then go through drug withdrawal after birth.

Necrotizing enterocolitis (NEC) is a serious illness in newborns. It happens when tissue in the large intestine (colon) gets inflamed. This inflammation damages and sometimes kills the tissue in your baby’s colon.

Postpartum hemorrhage is more bleeding than normal after the birth of a baby. It is more likely with a cesarean birth. It most often happens after the placenta is delivered, but it can also happen later. Read on to learn more.

The normal length of pregnancy is 37 to 41 weeks. Postmaturity is a word used to describe babies born after 42 weeks. Very few babies are born at 42 weeks or later. Other terms often used to describe these late births include post-term, postmaturity, prolonged pregnancy, and postdates pregnancy.