An infant's blocked nose is usually manageable with simple, non-medicated measures such as sterile saline drops, gentle nasal suction, and a cool-mist humidifier. Using these methods correctly can help loosen mucus and make feeding and sleeping more comfortable.
Avoid over-the-counter decongestants, antihistamines, essential oils, and other remedies that may be unsafe for babies. Most importantly, watch for signs of breathing difficulty, poor feeding, fever, or unusual lethargy, and seek medical advice promptly if they occur. When in doubt, speak with your paediatrician before trying a new treatment for your baby.