Colds in Babies: 7 Ways to Comfort Your Little One Through Congestion

If your baby is under 3 months old and has a rectal temperature of 100.4°F (38°C) or higher, call your pediatrician immediately — do not wait to see if it comes down. In babies this young, a fever is a medical emergency until proven otherwise. This is the single most important thing to know about illness in newborns.

Beyond fever, colds in babies are common, uncomfortable, and usually manageable at home — but newborns need close watching because their airways are tiny and they cannot blow their noses. Here is what to look for, what to do, and when your baby needs to be seen.

Cold Symptoms in Babies Under 3 Months

• Stuffy or runny nose (clear mucus is typical; yellow or green may signal a secondary infection)
• Sneezing, mild coughing
• Slight decrease in feeding
• Fussiness or disrupted sleep

Colds in newborns typically last 7–10 days. Symptoms may peak around days 3–5.

How to Help Your Baby at Home

• Saline drops + bulb syringe: Place 2–3 drops in each nostril, wait a minute, then gently suction. Use before feeds and sleep.
• Humidifier: Cool-mist humidifier in the room adds moisture and eases congestion.
• Keep feeding: Breast milk provides immune support. If nasal congestion makes feeding hard, use saline first.
• Elevate slightly: Put a rolled towel under the crib mattress end — never inside the crib — to help drainage overnight.
• No medications: OTC cold or cough medications are not safe for babies under 2 years. Do not use them.

When to Call Your Pediatrician

• Fever of 100.4°F or higher at any point under 3 months
• Breathing that looks labored — nostrils flaring, ribs visible with each breath, belly breathing
• A cough that is getting worse or sounds like a bark or whoop
• Baby refuses to feed for more than one feeding in a row
• Symptoms have not improved at all after 10 days
• Your gut says something is wrong — trust it