It is VERY important at this time that you do NOT leave the country without specific written consent of your husband. You should even consider getting a notarized signature agreement from him, and keep a copy of that written agreement with you at all time as well as your son's passport, while you are in Mexico. We are all aware of how vigorously law enforcement pursues "AMBER ALERTS" here in California. That would be my concern. Even if you tell him, and he agrees verbally, he could later change his mind and report you and the child MISSING. Do not risk this. Also, once a dissolution of marriage case is filed, you will not be permtted to leave the state without the written permission of the child's father or a court order. So, be on the safe side, get his permission in a clear written document before you go anywhere.
A weekly guide with tips and legal advice for each stage of the process.