You said you would be traveling within Argentina. However, if you leave the country keep in mind the documents required for traveling with minors. This applies if you have a temporary or permanent visa. It should not be the case with a transitory (tourist) visa.
Minors. For Argentine law, all persons under 21 years of age are minor. This is only until the new law passed 2 weeks ago modifying this to 18 years of age comes into force.
The documents required for traveling with minors are the following:
If traveling alone or with only one of the parents:
- Permit / Travel Authorization of the missing parent
- Birth Certificate or Marriage Book
If traveling with both parents:
- Birth Certificate or Marriage Book
Minor not traveling with any parent
-Birth certificate of the child or Marriage Book where the child is registered.
-Parental consent given before a judicial authority, notary or other public authority with the following requirements:
0 to 13 years of age: The parental consent must contain the country of destination, travel dates and details of the person who will accompany and / or receive (full name, document type and number and address)
14 to 17 years: The parental consent should only contain the country of destination and details of the person who will accompany
18 to 21 years: An authorization given by the parents in court, notary or other public authority is sufficient. This, however, be changed soon because of the civil code reform last week.