Babies can’t blow their noses or cough up phlegm the way older children can, so clearing mucus falls almost entirely on you. The good news is that most infant congestion resolves on its own within a week or two, and a few simple techniques can keep your baby comfortable in the meantime. The core approach combines saline drops, gentle suctioning, extra fluids, and humid air.
Why Babies Struggle With Phlegm
Newborns are obligate nose breathers, meaning they rely on their nasal passages to breathe while feeding. Those passages are tiny, so even a small amount of mucus can cause noticeable congestion, noisy breathing, and feeding difficulty. Babies also lack the coordination to cough productively or sniff mucus to the back of the throat and swallow it. What sounds alarming to a parent is often just a normal cold working through very small airways.
Saline Drops and Suctioning
This is the single most effective thing you can do at home. Saline thins sticky mucus so it’s easier to remove, and a bulb syringe pulls it out of the nose mechanically.
Lay your baby on their back and place 3 to 4 saline drops into each nostril. Hold their head back gently for about a minute to give the saline time to work. Then squeeze all the air out of the bulb syringe before you insert it, place the tip gently into one nostril, and release the bulb. The suction will draw mucus into the bulb. Squeeze it onto a tissue and repeat on the other side.
A few rules keep this safe and effective. Always suction before a feeding, not after, because suctioning on a full stomach can cause vomiting. Limit suctioning to no more than four times a day; doing it more often irritates the delicate lining of the nose and can actually make congestion worse. After each use, wash the bulb syringe in warm soapy water, squeeze soapy water in and out several times, then rinse thoroughly with clean water.
You can buy premade saline drops at any pharmacy, or make your own by dissolving a quarter teaspoon of table salt in one cup of warm (not hot) tap water. Use a clean jar, and throw away any unused solution after each session.
Keep the Air Moist
Dry air thickens mucus. A cool-mist humidifier in your baby’s room helps keep secretions loose and easier to clear. Always choose a cool-mist model for children; warm-mist humidifiers and steam vaporizers pose a burn risk if a child gets too close or if hot water spills. To prevent bacteria and mold from growing inside the unit, empty the tank and dry all surfaces daily. Filling it with distilled or purified water instead of tap water reduces mineral buildup.
For quick relief, you can also sit in the bathroom with your baby while a hot shower runs (with the door closed). The steamy air loosens phlegm temporarily and can make suctioning more productive right afterward. Hold your baby on your lap rather than placing them near the water.
Fluids and Feeding
A congested baby often feeds poorly because breathing through a blocked nose while sucking is hard. Shorter, more frequent feedings help your baby stay hydrated without exhausting themselves. For breastfed babies, nurse more often. For formula-fed babies, offer smaller, more frequent bottles. Babies under six months should not be given water or other fluids unless a doctor advises it; breast milk and formula provide all the hydration they need.
Watch for signs that your baby isn’t getting enough fluid. Fewer than one wet diaper every six to eight hours, dark urine, a dry mouth, or no tears when crying are all markers of dehydration. If you notice these, start tracking wet diapers and feeding amounts so you can share that information with your pediatrician.
What Not to Do
Over-the-counter cough and cold medicines are not safe for babies. The FDA and the American Academy of Pediatrics recommend against giving any OTC cough or cold product to children under four years old. These medications do not make symptoms resolve faster, and in young children they carry real risks of dangerous side effects, especially when dosed incorrectly.
Honey is a proven cough suppressant for older children, but it must never be given to a baby under 12 months. Honey can contain spores that cause infant botulism, a serious form of food poisoning.
It may seem logical to prop up a congested baby’s mattress or place them on a pillow so mucus drains better, but this is unsafe. The AAP recommends babies always sleep flat on their backs on a firm, even surface with no pillows, wedges, rolled towels, or other props. When a baby’s head is elevated or propped, 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 inclined sleepers (anything with more than a 10-degree angle) for exactly this reason.
Signs of Breathing Trouble
Most phlegm in babies comes from ordinary colds and clears up without medical treatment. But babies can deteriorate quickly, so it’s important to recognize when congestion has crossed into respiratory distress. The key signs to watch for are:
- Nasal flaring: the nostrils widen visibly with each breath as your baby tries to pull in more air.
- Retractions: the skin pulls inward between the ribs, below the ribcage, or at the base of the throat during breathing. This means your baby is using extra muscles to breathe.
- Grunting: a short, low-pitched sound at the end of each breath. It’s the body’s attempt to keep the lungs open.
- Fast breathing: consistently more than 60 breaths per minute in a newborn or noticeably rapid breathing in an older infant.
Any of these signs warrants prompt medical attention. The same goes for a fever in a baby under three months, refusal to feed for several hours, signs of dehydration, or a bluish tint around the lips or fingernails. In some cases, a doctor may prescribe nebulized saline treatments, particularly for conditions like bronchiolitis, where mucus and inflammation narrow the smallest airways in the lungs. This is a clinical decision, not something to attempt at home without guidance.