A child born abroad of legal permanent resident parents may enter the U.S. without a visa provided the child is accompanied by a parent upon that parent's initial return to the U.S. within two years of the child's birth with documentation showing the parent-child relationship. If the child is not brought back to the U.S. when the parents initially enter the U.S. (following the birth) within this time period, the child must obtain an immigrant visa to enter the U.S. In this case, the legal permanent resident parent(s) must file an immigrant visa petition with the U.S. Citizenship and Immigration Services.