There was a time before 2010 when you could go to Mexico for a few days and all that was required to return was a valid U.S. ID or a birth certificate. That changed in 2010 when the immigration regulations changed and a valid passport was required for all citizens, including children. There are certain exceptions which are not relevant to this blog, but that can be reviewed at U.S. Department of State.
Living in San Diego, travel to Mexico is a regular activity for many families. Whether it is to visit family still living in Mexico, for medical care, or just for pleasure travel, the draw of the beautiful beaches and fresh seafood is very strong.