Hi thanks for writing to Practo consult. Child is too small so please visit pediatrician. Meanwhile give saline nasal drops to receive baby with blocked nose.
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Do read my article it may help you..."Common Cold: Its Very Common, Don't Panic" by Dr. Poonam.M. Sambhaji - https://www.practo.com/healthfeed/common-cold-its-very-common-don-t-panic-8682/post