Baby Testing: 6 Essential Health Screenings for Your Newborn

Although your obstetrician tracks your fetus throughout pregnancy via ultrasound, blood tests, and amniocentesis, some things can't be assessed until after your baby is delivered. So only seconds after your newborn enters the world and takes his first gulp of air, he'll start on a round of tests and procedures that protect his health. Here's a cheat sheet on what to expect for infant health screening.

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How they're done: A doctor or nurse will check your baby's appearance, pulse, grimace, activity, and respirations (the first letters spell Apgar), each of which is scored from 0 to 2. A score of 10 is perfect, but most healthy babies score in the 8 to 9 range.

Why your baby needs them: The scores evaluate your baby's heart and lungs, and they assess how well he's making the adjustment from life inside your womb to life in the outside world. A baby who gets a score of 3 or less needs immediate medical attention.

When they're done: One minute after birth and then again five minutes later.

Side effects: None.

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How it's done: Doctors will insert a probe into your baby's ear or put earphones on him. They'll then put monitoring devices on his head to record his brain waves as he responds to sounds sent through the probe or the earphones.

Why your baby needs it: Because hearing loss is hard to detect in a baby in the first few months of life, many states require this test. It can pick up any congenital hearing loss.

When it's done: Usually in the first 48 hours of life.

Side effects: None.

How it's done: A few drops of blood from your baby's heel are sent to a lab for analysis. Doctors can perform multiple tests on that tiny sample.

Why your baby needs it: Although relatively rare, metabolic disorders can cause mental retardation, stunted growth, and even death. But if caught early, potential health problems can be prevented and even reversed. Your baby will be screened for anywhere from three to 50 different disorders, depending on which state he's born in. At the very least, he'll be screened for phenylketonuria (a condition that makes it impossible for the body to break down certain food substances), galactosemia (an inherited, genetic condition in which the body lacks the enzyme that breaks down a certain sugar), and congenital hypothyroidism (a disease caused by an underactive thyroid gland). But the Department of Health and Human Services is considering a requirement that at least 30 tests be done by all states.

When it's done: In the first 24 to 48 hours of life.

Side effects: Usually none. Your baby may feel a slight pinch in her heel. The puncture is covered with a bandage.

How it's done: The vaccine is injected into the thigh.

Why your baby needs it: In the U.S., there are 1 million carriers of hepatitis B, a disease that can cause chronic liver problems. It's spread through having contact with the blood, semen, vaginal fluids, and other body fluids of someone who already has a hepatitis B infection. Because of the mix of maternal and fetal blood during delivery, mothers with hepatitis B are likely to pass the illness along to their babies during birth. A series of three vaccinations prevents people from getting the disease.

When it's done: Babies born to hepatitis B-positive mothers receive the vaccine and antiserum – which contains infection-fighting antibodies – within the first 12 hours of life. Those whose mothers tested negative may receive the vaccine before being discharged from the hospital or within the first few weeks of life.

Side effects: Possible redness or swelling at the injection site.

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How it's done: A vitamin K injection in the thigh is given to all newborns to prevent bleeding disorders.

Why your baby needs it: Although it's rare, 0.25% to 1.7% of infants are born with a vitamin K deficiency. That can prevent blood from properly clotting, putting these babies at risk for excessive bleeding. Rather than performing tests and waiting for results, doctors err on the side of caution and give all newborns an injection of vitamin K. This reduces chances of VKDB significantly.

When it's done: Most states mandate that all babies receive vitamin K as soon as possible (usually within the first hour) after birth.

Side effects: Generally none. As with all injections, though, there is a slight risk of infection. Some parents who object to the shot are less concerned about the needle than they are about old reports there may be a connection between vitamin K and childhood leukemia. The American Academy of Pediatrics issued a statement saying research conducted by a task force found no association between vitamin K injections and leukemia.

How it’s done: Hospitals put an antibiotic ointment (usually erythromycin) in Baby’s eyes.

Why your baby needs it: Eye ointment for newborns is given in case the mother has Chlamydia or gonorrhea. While the eye ointment kills other germs as well, it’s mandatory is to prevent blindness caused by these two STDs.

When it’s done: Within 24 hours of birth.

Side effects: None. Newborns don't seem to notice the ointment, though it probably makes their vision a little blurrier than it already is at birth.

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In addition to the many tests your baby will get, the American Academy of Pediatrics (AAP) recommends screening all newborns for jaundice – a common but serious condition in newborns that causes the skin and the whites of the eyes to turn a yellowish color. About 50 to 60 percent of newborns have jaundice, which occurs when bilirubin, a natural blood-breakdown product, builds up in your baby's bloodstream. Bilirubin is normally eliminated by the liver, so once your baby's liver is working efficiently, her yellow tint should disappear. But don't take any chances. Because high levels of bilirubin can cause deafness, cerebral palsy, or brain damage, the AAP recommends you schedule a follow-up visit with your doctor when your baby is between 3 and 5 days old. That’s when bilirubin levels reach their peak.