Beefed up online child privacy protections, approved by the Federal Trade Commission in December, must be in place by July 1 despite complaints by business groups that say they need more time, the FTC announced Monday.

The new rules, integrated into the existing federal Children's Online Privacy Protection Act (COPPA), expand the list of electronic data that businesses, including third parties, are forbidden from collecting from children 12 and under without parental permission.

In a letter to five business groups, including the Internet Advertising Bureau and the Application Developers Alliance, FTC secretary Donald S. Clark wrote that "the Commission finds no basis for delaying the effective date."

Clark said that it was announced in 2011 that the changes were on "an accelerated schedule" due to "the rapid-fire pace of technological change ... including an explosion in children's use of mobile devices, the proliferation of online social networking and interactive gaming."

Read more about the rule enhancements here.