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非常感谢8老师详细的解释。这样说起来我朋友应该可以把孩子先用免签带进来，之后再在这里给他转身份了吧？
但是免签是没有I-94表格的，有90天停留期，她还需要注意什么吗？
-The child needs to go to the local Deferred Inspection Office/Site to get the I-94 for I-485 filing. Find the local CBP office here:
70 Deferred Inspections Sites

Although technically the child can file I-485 using Visa Waiver Program (VWP), I still suggest that child had better apply for B-2 visa in the US Consulate to enter US which has better chance for I-485 approval than using VWP.  If the child can not get the B-2 visa, then just use VWP to enter US.