A.C.
One more plug for Simply Saline. Great stuff. you can also do a little reflexology on his feet. Just a little light massage on his toes and the pad under his toes. The pad reflexes his chest. There is a point for the sinuses on the outside of the big toe.
One of the best things you can do is take him to see a chiropractor. He is not too little and you will be amazed with the results.