use saline nasal drops

use nasomist

you can use remedy suggested by roopashree, but do consult with paediatrician soon.. do not self medicate...

Consult your doctor.. they will prescribe you some nasal drops. Just one drop in each nostril will clear your problem. Also you can buy Eucalyptus Oil ( nilgiri oil) and put 3-4 drops on the pillow near to baby ( no direct application anywhere) . The smell will give some relief.

use predicated navosion