Newborn breathing problems most commonly stem from immature lungs, leftover fluid from delivery, infections, or structural differences present at birth. A healthy newborn breathes 40 to 60 times per minute, and anything consistently faster, slower, or visibly labored signals that something may need attention. Some causes resolve on their own within hours, while others require immediate medical support.
How to Recognize Breathing Trouble
Newborns can’t tell you they’re struggling, but their bodies show it clearly. The key signs of respiratory distress are fast breathing (consistently above 60 breaths per minute), nasal flaring, grunting, and retractions. Nasal flaring is when a baby’s nostrils widen with each breath as the body tries to pull in more air. Retractions are visible sinking of the skin between the ribs, below the ribcage, or at the base of the throat during each inhale. You can see the muscles pulling hard to expand the chest.
Grunting is a short, low-pitched sound a baby makes at the end of each breath. It happens because the body is reflexively closing the airway briefly to keep the tiny air sacs in the lungs from collapsing. A bluish tint to the skin, especially around the lips and fingertips, signals that oxygen levels have dropped and the situation is urgent.
Surfactant Deficiency in Premature Babies
Respiratory distress syndrome (RDS) is the most common serious breathing problem in preterm infants. The lungs normally produce a slippery substance called surfactant that coats the tiny air sacs and keeps them from sticking shut. Premature babies often don’t produce enough of it yet. Without that coating, the surface tension inside the air sacs is too high, and they collapse with each exhale. The baby then has to work much harder to re-inflate them with every breath, and large portions of the lung can’t exchange oxygen at all.
The earlier a baby is born, the higher the risk. Babies born before about 28 weeks have very little surfactant production, while those born after 34 weeks usually have enough to breathe independently. Treatment focuses on delivering surfactant directly into the lungs and providing breathing support. For the smallest and most premature babies (born around 22 to 23 weeks), a breathing tube is typically placed right away. Babies born after 25 weeks who are breathing on their own generally start with gentler support: a device that delivers continuous air pressure through small prongs in the nose, helping keep those air sacs open between breaths.
Leftover Fluid in the Lungs
Before birth, a baby’s lungs are filled with fluid. During labor, hormonal changes trigger the lungs to start absorbing that fluid, and the physical squeeze of passing through the birth canal helps push it out. When this process doesn’t happen fully, the result is transient tachypnea of the newborn (TTN), the most common cause of fast breathing in otherwise healthy-looking babies.
TTN is especially common after cesarean deliveries performed before labor begins. Without the hormone surge and physical compression of labor, the fluid simply doesn’t clear as efficiently. The baby breathes rapidly and may need supplemental oxygen for a short time, but TTN is not an infection and not a sign of lung damage. Most babies recover completely within 24 to 72 hours with nothing more than close monitoring and supportive care.
Meconium Aspiration
Meconium is a baby’s first stool, a thick, dark, sticky substance that occasionally gets passed before or during delivery, usually in response to stress. If a baby inhales meconium-stained fluid, it can cause problems in three ways at once. Thick meconium can physically plug small airways, blocking airflow much like a foreign object would. A partial blockage can trap air in sections of the lung, raising the risk of a small air leak called a pneumothorax. The meconium also triggers intense inflammation in the lung tissue, a form of chemical irritation. On top of that, it breaks down the surfactant already present, increasing surface tension and making it even harder for air sacs to stay open.
Meconium aspiration syndrome ranges from mild to severe. Some babies need only supplemental oxygen for a few days, while severe cases require intensive respiratory support.
Infections That Affect Breathing
Newborns can develop pneumonia or bloodstream infections picked up during delivery, and breathing difficulty is often the first visible sign. Group B Streptococcus (GBS) is one of the most common culprits. Most newborns who develop GBS disease in the first week of life show symptoms on the day of birth: rapid or labored breathing, fever, feeding difficulty, unusual limpness, and sometimes a bluish skin color.
Pregnant women are routinely screened for GBS late in pregnancy, and those who test positive receive antibiotics during labor to reduce the chance of transmission. When neonatal infection does occur, it’s treated aggressively because the combination of immature lungs and active infection can escalate quickly.
Failed Circulatory Transition at Birth
In the womb, a baby’s lungs don’t handle oxygen exchange, so blood largely bypasses them. At birth, the blood vessels in the lungs are supposed to relax and open up, allowing blood to flow through and pick up oxygen for the first time. In persistent pulmonary hypertension of the newborn (PPHN), that transition fails. The blood vessels in the lungs stay constricted, pressure remains high, and blood continues to bypass the lungs through fetal pathways that should be closing.
The result is a baby whose oxygen levels are dangerously low and highly unstable. A hallmark of PPHN is “labile hypoxemia,” meaning oxygen saturation can swing dramatically from one moment to the next without any change in the support being provided. PPHN can happen on its own, but it more often develops alongside another problem: meconium aspiration, pneumonia, sepsis, or a structural lung defect. Treatment centers on carefully lowering the resistance in the lung blood vessels while supporting oxygenation.
Structural Problems Present at Birth
Some babies are born with physical differences that prevent normal lung development or function. Congenital diaphragmatic hernia (CDH) is one of the more serious examples. The diaphragm, the muscle that separates the chest from the abdomen, has a hole in it. During fetal development, abdominal organs like the intestines, stomach, or even part of the liver push up through that opening into the chest cavity. This crowds the space where the lungs should be growing.
The result is lungs that are significantly smaller than normal, with fewer air sacs and underdeveloped blood vessels. Nearly all newborns with CDH have immediate breathing difficulty. The severity depends largely on how much of the abdominal contents have moved into the chest and how much lung development was affected. In severe cases, a substantial portion of the liver sits in the chest and the lungs are very small. CDH also commonly leads to pulmonary hypertension because the blood vessels surrounding the underdeveloped lungs don’t function properly.
Other structural causes include narrowed or absent nasal passages (choanal atresia), abnormal growths in the airway, and malformations of the lungs themselves. These are far less common but are usually identified quickly because the baby shows breathing distress immediately at birth.
Why Prematurity Is the Biggest Risk Factor
Prematurity runs through nearly every cause on this list. Premature lungs lack surfactant. Their fluid-clearing mechanisms are less mature, raising TTN risk. Their immune systems are less prepared to fight off infection. And their blood vessels are more prone to the kind of constriction that leads to pulmonary hypertension. A baby born at 26 weeks faces a fundamentally different set of respiratory challenges than one born at 39 weeks, even when the specific diagnosis is the same.
Other factors that increase risk include cesarean delivery without labor (due to reduced fluid clearance), maternal infections, prolonged or complicated labor, and a family history of certain congenital conditions. Male newborns also tend to have slightly higher rates of respiratory distress syndrome compared to females at the same gestational age, though the reasons for this aren’t fully understood.