Neither. If you simply give your child a credit card that is in your name, it won’t have any effect on his or her credit. If you add your child as an authorized user on your existing credit card account, however, the account may be added to his or her credit reports. That won’t have any effect on your scores. But it could help your child’s, especially if you manage the account responsibly. It can also hurt your child’s scores if you improperly manage the account.