Are there any decongestants for children that would relieve him or something that I could give him?

Yes, there are decongestants available for children that can provide relief. However, it is not recommended to give oral decongestants or nasal sprays to children under 6 years old due to limited data on their effectiveness and potential risks of side effects. It is generally advised to let a cold run its course, which can last up to 7 to 10 days. One suggestion is to use a saline solution to help clear your child's nasal passages. This involves administering the solution in each nostril and then having the child blow their nose one nostril at a time.