You might want to try the one that I am giving my son. It is recommended to me by a health consultant friend.

It is 100% natural and I have been taking it since I was pregnant… all the way till my son was born, he has been taking it for 2 years and has never seen a doctor in his life

I had a friend whose son recovered from asthma after taking this pdt and another whose son recovered from eczema… if you would like to find out more, you can email me at verityy@yahoo.com
References :

76.5% of patients with bronchial asthma said they benefited from chiropractic treatment. Peak flow rate and vital capacity increased after the third treatment. Significantly lower quality of life impairment rating scores were reported for 90.1% of children after 60 days of chiropractic care. During this same time period the average number of asthma attacks decreased an average of 44.9%, and asthma medication usage was decreased an average of 66.5%. Among parents of asthmatic children who had received chiropractic treatment, 92% considered this treatment beneficial.
References :
http://www.chiro.org
1st year Chiropractic Student
B.S. (bachelors of science)
long time chiropractic patient

For a 5 year old probably 1 or 2 capsules a day would be enough.
References :

http://www.newstarget.com/004919.html
Highlight:
Certain foods that contain high quantities of omega-3 fatty acids and/or a nutrient called uridine, such as salmon, herring, walnuts, sugar beets, and beet molasses, may have natural depression-fighting qualities, according to a research report published in Biological Psychiatry. Scientists have long known that nations consuming large quantities of fish had low levels of both heart problems and clinical depression.
References :
http://www.newstarget.com/004919.html

i would prefer you give her whole wheat bread (the brown bread) as not only will she develop a healthy habbit it will benefit her system from the start….!!

hope i helped!
anyway thanks and have a great day !!!~
God bless,
natalie.
References :

Also, do NOT do what Darleen M said…. 5 year old children should NOT have Iron unless their doctor says so, as it can be toxic (or fatal in high enough doses) in children that young.
However, a children’s multivitamin would be a good idea in general, but that’ll only cover the basic health aspects.

Unfortunately, most herbs and supplements that would be good for boosting the immune system are only recommended for people at least 16 years or older, although a few are made with children’s doses. I would suggest asking his pediatrician what the best thing for him would be because his doctor can look at his medical history and problems he’s experienced (frequent illness should put up enough of a red flag for him that he should be able to suggest something helpful). Good luck!
References :
I’m a Product Specialist for a vitamin company