If I'm married and my wife she is from Ecuador, what documents I need to bring her 2 minor daughters with me to the US?

Hello. You will need mariage and birth certifciates. If applicable, you will need divorce certificates as well. Copies of passport and your income documentation. You will need to translate their certificates into English. You may also show some additional dodcumentation that you have met and have joint accounts, etc. Best of Luck.

You will need to have your marriage certificate, with an English translation, your wife's birth certificate, her divorce decree from her previous marriage, and the children's birth certificates.  All documents need to have an English translation.  You will also need your birth certificate and/or other proof of US citizenship.