Many media outlets are reporting on the unprecedented wave of children arriving in the United States in recent months, reported to be more than 52,000 unaccompanied children and 39,000 adults with children since October 2013. on track to reach a total of 60,000 for the current year.  New York Times coverage by Julia Preston includes these articles:

Snakes and Thorny Brush, and Children at the Border Alone,  (NYT June, 25, 2014)
Aid Group Alleges Abuses of Young Border Crossers, (NYT June 21, 2014)
U.S. Moves to Stop Surge in Illegal Immigration (NYT June 20, 2014) ( with Randal C. Archibold)
Migrants Flow in South Texas, As Do Rumors (NYT June 16, 2014)
New U.S. Effort to Aid Unaccompanied Child Migrants (June 2, 2014)
U.S. Setting Up Emergency Shelter in Texas as Youths Cross Border Alone (NYT May 17, 2014).

The Washington Post has followed the response of the federal government to the current crisis:

David Nakamura, Obama Administration announces new steps to stem flow of immigrants at Texas border (Wash Post June 20, 2014)
David Nakamura, Influx of minors across Texas border driven by belief that they will be allowed to stay in the U.S. (Wash. Post June 13, 2014)
Pamela Constable, Immigrant Parents Urge U.S. Officials to Help Their Children Flee Central American Violence (Wash. Post June 12, 2014)

There are also many children in migrant camps on the Mexican side.  See Joshua Partlow and Nick Miroff, Young migrants stuck in limbo on Mexican border (Wash. Post June 20, 2014).

Useful blogs and opinion pieces include these two items:
Greg Sargent (Washington Post): Hillary: Minors crossing border must be sent home(June 18)
Harold Myerson (Washington Post): A new generation of poor huddled masses heads north (June 18).