NEW YORK ( TheStreet) -- Child identity theft is a growing problem in the U.S., with one in 40 households with kids under the age of 18 have been victimized, according to the Identity Theft Assistance Center. The fraudsters use a child's persona data to get a new identity so they can get a job, government benefits, medical care and auto loans and mortgages, the center says. Child identity fraud can be particularly prevalent during back to school season, given the rise of sign-up forms, school registration and dorm move-ins. How can parents fight back? IdentityTheft911.com offers the following tips for parents: Don't give up Social Security data unless you have to. IDTheft911 says some schools, especially day care centers and preschools, will ask for your child's Social Security number. Don't give it up so easily. Offer a birthdate but explain you're reluctant to share the Social Security numbers. Chances are they'll go along. Be careful at sporting events. Most parents have signed their kids up for soccer or baseball without really knowing who's seeing that information. As IdentityTheft911.com says, some local athletic organizations are great at protecting that data -- others are not. If in doubt, simply write in "contact me at (phone number) for information" before you release data, especially Social Security numbers and medical identity numbers. Once an organizer contacts you directly, ask them how they protect data from I.D. thieves, and give only what you have to. And never give out Social Security of medical I.D. numbers. I.D. theft protection software to guard their personal identities. Know what's at risk -- and protect it. IdentityTheftAssistance.org advises keeping all documents that show a child's personal information under lock and key. At the very least, that information includes a child's date of birth, Social Security number and birth certificate. Be aware that August and September are prime time for child I.D. theft. A lot of money and information is changing hands right now in preparation for the classroom, so keeping close tabs on both is the surest way to prevent your family from identity theft.