App Store的应用有4个年龄分级,分别为4+、9+、12+和17+,年龄分级是指该应用(软件、游戏或者媒体内容等)允许面向的用户群的年龄,其中4+为4岁以上,9+为9岁以上,以此类推.
对于4+这个级别,Apple要求比较苛刻,下面这几条只有任何一点满足提交审核都会被拒,

• Does your app include third-party analytics? If so, please provide details about what data is collected for this purpose.
• Does your app include third-party advertising? If so, please provide a link to the ad network’s publicly-documented practices and policies for kids apps.
• Will the data be shared with any third parties? If so, for what purposes and where will this information be stored?
• Is your app collecting any user or device data for purposes beyond third-party analytics or third-party advertising? If so, please provide a complete and clear explanation of all planned uses of this data.