Journals can be very helpful both in pointing you to other primary source materials, as well as providing insightful legal analysis. Journals can be especially helpful in the area of children's advocacy law because they may point you to scientific and technical sources about child development and psychology that would be harder to find on legal databases.
Below is a selection of journals that focus on children's law or children's rights (or family law, which should include some articles focused specifically on children. Some of these are available in print, and most of them are available online:
American Journal of Family Law
Children's Legal Rights Journal
Children's Regulatory Law Reporter
Journal of Law and Family Studies
Juvenile & Family Court Journal
The International Journal of Children's Rights
The International Journal of Law, Policy, & the Family