Decoding the NICU: Common Terms and Acronyms for Parents (Part 1)

Hearing unfamiliar acronyms and technical terms can add stress during an already emotional NICU experience.

My early labor and preemie journey landed me in 2 different countries, where I not only needed to communicate in a different language, but also understand NICU lingo. This is a 3-part series that explains essential NICU terms to help you feel more confident and informed from day one. We'll cover about 10 each time.

Here are the first 10 NICU terms:

1. NICU (Neonatal Intensive Care Unit)

   This may seem weird, but remember I'd never even given the NICU a thought before my own experience. I knew it was an area specifically for premature babies or those born with some complications. The NICU is a specialized unit for babies who need extra medical care after birth.

   
   

2. GA ( Gestational Age)

   The number of weeks your baby has been in the womb, from the first day of your last period.

   
   

3. Preemie ( Premature baby)

   A baby born before 37 weeks of gestation.

   There are different categories when it comes to preemies:

   Extremely preterm: Born before 28 weeks of gestation

   Very preterm: Born between 28 and 32 weeks of gestation

   Moderately preterm: Born between 32 and 34 weeks of gestation

   Late preterm: Born between 34 and 36 weeks of gestation

   
   

4. Birth weight plays an important role with preemies, but generally speaking, the earlier a baby is born ,the more medical support they're likely to need.

   
   

   I lost all my amniotic fluid at 27 weeks, but gave birth at 30 weeks.

   (This is a story for another time)

   
   

5. Corrected Age

   The age your baby would be if born on their due date—used to track milestones. You'll probably be using this age as a reference for milestones until your baby is about 2 years old.

   
   

6. Apgar Score

   A quick assessment done at 1 and 5 minutes after birth that checks a newborn's overall condition. It checks five key signs: appearance, heart rate, muscle tone, and respiration ( breathing).

   
   

   In my case, they whisked my preemie away so quickly that I never saw or heard any mention of Apgar scores. Everything happened in a blur, and I wasn't given any information at the time.

   
   

7. Incubator (or Isolette)

   A temperature and humidity controlled bed used to care for premature or ill newborns.

8. It provides a safe, warm, environment and often includes features that control humidity, monitor vital signs.

   This is really their first home.

   I remember what it was like seeing my baby inside the incubator for the first time, but I'll talk about that in another post.

   
   

9. Bilirubin

   Bilirubin is a yellow substance that’s produced when the body breaks down old red blood cells. Normally, the liver processes bilirubin and helps remove it from the body. But in newborns—especially premature babies—the liver isn’t always mature enough to get rid of bilirubin efficiently. When too much of it builds up, it can lead to jaundice, which causes the baby’s skin and eyes to look yellow. Jaundice is pretty common in newborns.

   
   

10. Phototherapy

    Blue light therapy used to treat jaundice in newborns. I remember seeing this blue light over my baby for the first time. It was just a strange thing to see, but of all the things he experienced, this was definitely not my biggest concern and also didn't cause him any pain.

    
    

11. RDS (Respiratory Distress Syndrome)

    A common breathing issue in premature babies, caused by immature lungs.

    
    

12. Kangaroo Care

    Kangaroo care is when a parent holds their baby directly against their bare chest. This simple yet powerful practice helps stabilize the baby’s heart rate, breathing, and temperature, while also promoting bonding, reducing stress, and supporting brain development.

    
    

    In my case, I didn’t get to hold my baby for the first three weeks. I assumed it wasn’t possible—or safe—because of all the wires and monitors. Thankfully, one of the NICU nurses asked if I had held him yet, assuming others had helped me with it. They hadn’t. That moment changed everything.

    
    

    The first time I held my baby, I felt an instant sense of calm. It soothed both of us in a way I’ll never forget. No machines, no alarms—just the warmth of connection.

    
    

    If you’re in the NICU and unsure whether you can hold your baby, ask your care team. I encourage you to start skin-to-skin as early and as often as possible. It’s not just safe—it’s healing.

    
    

Curious to learn more? Part 2 is on the way.