谢谢， 会call uscis， 但怕customer service业务不精， 就是他们告知file N600, 但被拒。
可以申请passport吗？
-Yes!
2017年申请也被拒， 告知要natralization证明， 现在还没入籍啊？
-Because the child had no green card at that time, he/she was not qualifed to be a US citizen. Now, because the child got the green card last year, he/she has been a US citizen automatically. Thus, he/she can apply for the US passport now. Just go to the local US passport application agency and they will tell you how to do. Bring the mother's naturalization certificate and the child's green card and birth certificate.
See the following link (read "Does my child have to get a certificate of citizenship before applying for a U.S. passport? " and "How does my child get a pasport under Section of 320 of the Immigration and Nationality Act?" parts):
FAQ: Child Citizenship Act of 2000 (state.gov)
