不需要簽證。 K 簽證是for 公民的

"As outlined in 9 FAM 42.1 N1.1, a child under two years of age who was born of a Permanent Resident Alien mother during a temporary visit abroad does not require an immigrant visa in order to travel to the United States if the alien parent is in possession of a valid Form I-551 (i.e. green card), a valid reentry permit, or an SB-1 visa. The child must be admitted to the U.S. within two years of birth and the accompanying parent must be applying for readmission upon first return after the birth of the child. We suggest that the accompanying parent carry documentary evidence of his or her relationship to the child, including the child's passport and birth certificate."