Javascript 数组覆盖问题

有这么一段代码：

        var datas=[];
        var data={};
        var i=0;
        $(".baby-panel").each(function(){
            var baby_id=$(this).children(".babyid").attr("baby_id");
            var baby_name=$(this).children(".babyname").find("input[name='baby"+i+"_name']").val().trim();

            var baby_sex=$(this).children(".babysex").find("input[type=radio]:checked").val();
            var baby_birth=$(this).children(".babybirth").find(".form-control").val();

            data["id"]=baby_id;
            data["name"]=baby_name;
            data["sex"]=baby_sex;
            data["birth"]=baby_birth;

            datas[i]=data;
            i++;
        });

问：如何循环将data的数据添加到datas中，现在datas的数据都是data的最后一条记录。
例如：data={["id":1,"name":1,"sex":1,"birth":2014-05-05],["id":2,"name":2,"sex":2,"birth":2014-06-05]}

经过each()遍历后，datas的输出*却是*[{"id":"2","name":"2","sex":"2","birth":"2014-06-05"},{"id":"2","name":"2","sex":"2","birth":"2014-06-05"}],

而不是：[{"id":"1","name":"1","sex":"1","birth":"2014-05-05"},{"id":"2","name":"2","sex":"2","birth":"2014-06-05"}]