When faced with an acronym for an association/foundation I always go to the website in question to see they have translated it already.
http://www.fleni.org.ar/
In the English version, it isn't translated, so this doesn't help in your case.

Then I search Google for the ways it may have been translated:
http://www.google.es/search?sourceid=ie7&q=Fundación para la...
Quite often you will be able to see a tendency to translate it one way or another. In your case, it seems that the words "childhood" "pediatric" and "infant" are all possibilities.

Then I consider which term I want to use and I check it out.
I chose "childhood" and from googling it I can confirm that others have also found it to be a valid translation in the context of your acronym.
http://www.google.es/search?sourceid=ie7&q=Fundación para la...

So that would be my suggestion :)

I'd prefer not to mention the words" fight against", which are implicit, I think