Understanding NICU Terminology

When my first son was born at 27 weeks and taken straight to the NICU, I felt completely lost. I remember standing there hearing words I had never heard before and feeling too overwhelmed to even ask what they meant. I did not know what a CPAP machine was or why alarms kept going off. I loved my baby deeply, but I felt like an outsider in his care because I did not understand the language being used around him.

By the time my second son was also in the NICU, the experience felt very different. I understood the terms, the monitors, and the routines. I was involved in his care every step of the way, to the point where the nurses often just oversaw while I managed much of it myself. Not because I was a medical professional, but because I had learned the language and what was happening with my baby.

I want that sense of empowerment for you.

This post is here to help you understand some of the common NICU terms you might hear. You don't need to be a doctor to care for your baby. Learning these words can help you feel confident, included, and empowered to actively participate in your baby's care.

Breathing

Desat You may hear a nurse say your baby had a desat, or desaturation. This refers to a drop in oxygen levels in your baby’s blood. Preemies and sick newborns often forget to breathe or have immature lungs, so these dips can happen. Some desats resolve on their own, while others need gentle stimulation or extra oxygen. This is scary but totally normal.

CPAP CPAP stands for continuous positive airway pressure. This is a type of breathing support that helps keep a baby’s airways open. It does not breathe for them, but it gives gentle pressure to make breathing easier. Seeing your baby on CPAP can be emotional, but for many babies it is a helpful stepping stone toward breathing fully on their own.

Brady Short for bradycardia, this means a drop in heart rate. Like desats, bradys are common in premature babies because their nervous systems are still developing. Often, they happen together with desats and resolve quickly.

A and B Spells You might hear staff talk about A and B spells. A stands for apnea, which means a pause in breathing. B stands for bradycardia, or a slow heart rate. These spells are closely watched and are part of why many babies need to stay in the NICU until they outgrow them.

Room Air When someone says your baby is on room air, it means they are breathing normal air without extra oxygen support. This is often a big milestone and a hopeful sign of progress! I literally cried when this happened- it feels like such a huge victory.

Feeding

OG Tube OG stands for orogastric. This is a feeding tube that goes through the mouth and into the stomach. Many NICU babies are too small or too tired to feed by mouth, so this tube helps them get the nutrition they need to grow. OG tubes are often used early on, especially when babies are very premature.

NG Tube NG stands for nasogastric. This feeding tube goes through the nose instead of the mouth and into the stomach. As babies grow stronger, they may switch from an OG tube to an NG tube, especially when learning to bottle feed or breastfeed. It allows them to practice oral feeding while still getting full feeds.

Reflux Some babies experience reflux, which is when milk comes back up from the stomach into the esophagus. This is common in premature babies or those with sensitive stomachs. Reflux can make babies uncomfortable and sometimes affects how feeds are given or spaced out. Both my babies had reflux in the first year of their lives and it went away on it's own.

Fortification means adding extra nutrients to breast milk or formula to help your baby grow. Many NICU babies need fortified milk to meet their nutritional needs, especially if they were born early or are very small. We went home on a milk plan that required fortification for additional calories until they caught up with their growth curve.

Growth and Age

Corrected Age Corrected age is used for babies who were born early. It adjusts your baby’s age based on their due date rather than their birth date. For example, if your baby was born two months early and is now four months old, their corrected age would be two months. Doctors and therapists often use corrected age when talking about development, milestones, and growth.

Actual Age Actual age, also called chronological age, is simply how old your baby is from the day they were born. This age is often used for things like vaccinations and medical records.

Other Common Terms

Bilirubin Bilirubin is a substance in the blood that can build up and cause jaundice, which looks like yellowing of the skin or eyes. Many newborns, especially premature babies, have higher bilirubin levels because their livers are still immature. Treatment often includes phototherapy, where your baby lies under special blue lights to help their body break down and remove bilirubin. While it can look alarming, this is a very common and well understood treatment in the NICU. Both my kids had phototherapy while in the NICU.

Kangaroo care is skin-to-skin contact where you hold your baby on your chest. This practice can help regulate your baby’s temperature, improve breathing and heart rate, and encourage bonding. It is one of the most powerful ways parents can be actively involved in their baby’s care, even while in the NICU. There are SO many benefits to Kangaroo care and I'll create another post about it. We did 6-8 of kangaroo care a day while in the NICU.

Rounds are the times when the NICU medical team comes together to review each baby’s progress, discuss treatment plans, and make care decisions. I always found this to be very intimidating but as I started asking questions and understanding the care plan, I was better able to participate. I will create another post about how to be more involved during rounds as a parent.

Being in the NICU is one of the most challenging experiences a parent can face. Learning the terminology and understanding what is happening with your baby can feel overwhelming at first, but it is also incredibly empowering. You are not just a visitor in your baby's care, you are an essential part of the team. Take your time, ask questions, and remember that every small step of understanding brings you closer to confidently advocating for your baby. You are capable, you are involved, and you are exactly where you need to be.