Spanish term (edited): que promueve hábitos de vida saludables y valores sociales entre los más pequeños.

Given the targeted age range that you state, "youngest children" would really not make sense (the "youngest", after all, would be a year or two old!). For the same reason, I don't think "very young children" would work either.

So I would just stick with "young children", which would seem to fit the age range you indicate.

Suerte. :)

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Note added at 7 hrs (2009-12-16 13:37:19 GMT)
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Typo: "healthy"

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Note added at 7 hrs (2009-12-16 13:40:19 GMT)
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The problem I see with "youngsters" here is that it it to general, as the term is often used to refer to teenagers as well. And adolescents are not part of the group of reference here.

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Note added at 8 hrs (2009-12-16 15:28:13 GMT)
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I'm on a bad typo streak:

Last comment should read:

The problem I see with "youngsters" here is that it is too general, as the term is often used to refer to teenagers as well. And adolescents are not part of the group of reference here.