There are several things that could be causing this, only one of wshich you can really control, which is temperature. It sound like you have temperature under control, but i would try the following, just in case:

"Bathe in warm (to the touch, about 80-85ºF/26.5-29ºC) water for 10-15 minutes. Then gently massage the iguana's belly, in smooth stokes from sternum to vent, for 5 minutes or so while it is still in the water. Let the iguana stay in the warm water (refreshing as necessary to maintain the proper temperatures) for at least another 10-15 minutes. The iguana should defecate within 24 hours if the blockage is due to being too cool, a very small piece or two of ingested substrate, or a very mild case of internal parasites"

If this does not work, there are other problems, which could include a larger parasitic infection, or blockage by a foreign object. In any case, if the first method doesn't work, you should take your iguana to a vet. They can instruct you on how to care for it, based on what they diagnose the problem as.
Hope this helps, I'm sure the little one will pull through!
Source(s):
http://www.anapsid.org/iguana/iguanaconstipation.html#Constipation


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