Babies can’t blow their nose or deliberately clear their throat, so when mucus builds up, parents often need to step in and help. The good news is that several safe, simple techniques can loosen congestion and encourage your baby to cough productively, moving mucus out of the airways where it belongs. The key is working with your baby’s natural reflexes rather than relying on medications, which are not recommended for infants.
Why Babies Struggle to Clear Mucus
Adults cough on purpose all the time. Babies can’t do that. Their cough reflex is functional, but they lack the muscle coordination and airway size to move thick mucus efficiently. Their nasal passages are also tiny, so even a small amount of congestion can sound alarming and interfere with feeding and sleep. The goal of every technique below is the same: thin the mucus, loosen it from the airway walls, and let gravity or your baby’s own reflexes push it out.
Use Saline Drops to Thin the Mucus
Saline drops are the simplest and most effective first step. A few drops of saline in each nostril soften and thin dried or sticky mucus, making it much easier for your baby to sneeze or cough it forward. Use drops rather than spray, because drops are gentler on an infant’s delicate nasal lining.
Lay your baby on their back with their head slightly tilted, then place two or three drops into one nostril at a time. Wait a few seconds to let the saline work before moving to the other side. The best times to do this are before feedings (so your baby can breathe while eating) and before bedtime. After the saline has loosened things up, you can use a bulb syringe or nasal aspirator to gently suction out whatever your baby can’t clear on their own.
Chest Percussion to Loosen Deeper Congestion
When mucus sits deeper in the chest, gentle chest percussion (also called chest physiotherapy) can help shake it loose so your baby’s cough reflex can do its job. This technique uses rhythmic, cupped-hand tapping on specific areas of the chest and back to vibrate mucus off the airway walls. It’s commonly taught to parents of babies with bronchiolitis or other respiratory illnesses.
Place a thin layer of clothing, like a T-shirt, over your baby’s chest. Cup your hand (or use a small percussor cup designed for infants) and tap firmly but gently. Done correctly, you should hear a hollow popping sound, not a slapping noise. Percussion should never leave red marks on the skin. Tap for about two minutes in each position:
- Upper chest (front): With your baby leaning slightly back, tap the area from the nipple line up to each shoulder on both sides.
- Upper back: With your baby leaning forward, tap over and above each shoulder blade.
- Side-lying: Lay your baby on their side with their arm extended. Tap over the side of the ribcage below the armpit.
- Lower back: Place your baby face-down on your lap and tap above the lower margin of the ribs on both sides.
Never percuss directly over the backbone, breastbone, stomach, or the lowest two ribs. These areas either offer no benefit or risk injuring delicate organs underneath. After a percussion session, your baby will often cough on their own as the loosened mucus moves upward.
Humidity and Steam
Dry air thickens mucus and irritates tiny airways. Running a cool-mist humidifier in your baby’s room keeps the air moist enough to help mucus stay thin and moveable. Boston Children’s Hospital recommends keeping indoor humidity between 35 and 50 percent. Below that range, the dry air itself can trigger coughing and make breathing harder. Above it, you risk mold growth, which creates its own respiratory problems.
A quick steam session can also help in the moment. Run a hot shower with the bathroom door closed for several minutes, then sit in the steamy room with your baby for 10 to 15 minutes. The warm, moist air loosens nasal and chest congestion and often triggers a productive cough. This works especially well right before a saline-and-suction routine or a chest percussion session.
What Not to Do
The instinct to reach for cough medicine is understandable, but the FDA does not recommend over-the-counter cough and cold medicines for children under 2. These products can cause serious side effects, including seizures and difficulty breathing. Manufacturers voluntarily label them for ages 4 and up. Homeopathic cough products carry similar warnings: the FDA has documented cases of infants experiencing seizures, allergic reactions, and dangerously low blood sugar after taking them.
Honey is a well-known cough soother for older children, but it is off-limits for any baby under 12 months. Honey can contain spores of the bacteria that cause infant botulism, a serious illness. The risk is highest in babies under 6 months, whose immature intestines allow the spores to grow and produce toxin.
You might also be tempted to prop your baby up on pillows or incline their mattress to help with nighttime congestion. This is not safe. The American Academy of Pediatrics recommends babies always sleep flat on their backs on a firm, even surface. When a baby’s head is propped up, their neck can flex forward or fall to the side, creating a bend in the airway that actually makes breathing harder. The Consumer Product Safety Commission has banned the sale of inclined infant sleepers for this reason.
When Congestion Signals Something More Serious
Most infant congestion is caused by common colds and clears up within a week or two. But certain signs suggest your baby needs medical attention quickly. A barking cough, which sounds like a seal, often points to croup and may be accompanied by a harsh, high-pitched sound when your baby breathes in. Wheezing, a whistling or purring sound on the exhale, can indicate bronchiolitis or another lower airway problem.
Watch your baby’s chest and neck while they breathe. If you see the skin pulling inward between the ribs, below the ribcage, or at the base of the throat with each breath, those are retractions, a sign your baby is working unusually hard to get air. Flaring nostrils and any bluish tint around the lips or fingertips are also red flags. Pneumonia, whooping cough, and inhaled foreign objects are all serious causes of infant cough that require prompt evaluation. If your baby is breathing fast, refusing to eat, or seems unusually lethargic alongside a cough, that combination warrants immediate attention.