K.H.
If he is really stuffed up try putting him in the bathroom with the hot shower running. The steam can help unplug his nose.
Also if you are concerned about allergies you should consider about changing your home environment.I educate parents how to make their homes safer for their children while helping them save money.
I help people dealing with Asthma, Allergies, Excema, ADD, ADHD, and others. Call me at ###-###-####.