发个可能比较少见的情况，老婆和我在准备墨西哥DY（郑爽），但因为我们都只有绿卡所以baby不能拿美国护照。然后因为政策规定baby在墨西哥也拿不到中国护照。所以看起来唯一的方法是让baby拿墨西哥护照，然后通过“落地绿卡”政策和我们一起回美国，不知是否有这样的DP？
Under U.S. immigration regulations, children who meet the following criteria do not need to obtain a visa to immigrate to the United States.
The child born abroad after the issuance of an immigrant visa is accompanying parent within the validity of the parent’s immigrant visa, or
The child born during the permanent resident mother’s temporary visit abroad provided that;
Admission is within 2 years of birth; and
Either accompanying parent is applying for readmission upon first return after the birth of the child.
