Last week was very dry. That may be why your bb had block nose. Buy a humidifier which may help. You can also use a small sheet of cotton sheet (3cm X 4cm) and soak it in drinking water and roll it into a stick. Put the wet cotton stick gently into bb's nose and wait for about 10 second. Then you use a nose sucking device (which you can buy from Jusco or Wing On) and try to suck out things which block your bb's nose. I usually do it after taking her bath. It would be easier.