The constitution defined as citizen as a person "born" in the United States, not "conceived" in the United States. Thus, a ZEF of an American mother is not a citizen of the United States.
For those who claim a ZEF should have identical civil and legal rights as a born child must then absolutely insist that all children illegally in the United States also are entitled to the same benefits, social programs, public assistance, education and legal status as a child born in the United States.
IF, as some pro-lifers want, the constitution is amended to declared a person comes into existence "at conception," then any woman who visits the United States as a tourist and who became pregnant in a way that the time frame allowed conception to have occurred in the USA can claim the child is a citizen. Or literally stepping across the Southern border or taking a boat within US jurisdictional limits and having sex would then also establish that child as an American.
Currently, USA law generally does NOT recognize the marriage of an American to a non-American that marry outside the USA. This prevents bringing in people from other countries by marriage. BUT if citizenship occurs at conception, this vastly opens that doorway - as the government could NOT prohibit a foreign nation pregnant with an American citizen from entry - meaning making a case that you had sex with a woman within USA territory resulting in pregnancy then required allowing that foreign woman into the USA - and with all public assistance for that "American" ZEF.
"Anchor baby" would be replaced with "Anchor sex."
While in law an illegal parent of a child born in the USA can be deported (but not the child), a woman illegally in the USA with an "American ZEF" could not because the ZEF could not be deported. Since medicine does recognize that natural breastfeeding is a health benefit to a newborn, she couldn't be deported after birth as cruel and unusual punishment to the American newborn baby.
If a pro-lifer demands ZEFs have child status, unless total hypocrites (commonly so) they also MUST demand that children illegally in the USA also have full legal status too.
ZEFs are not citizens of the United States according to the U.S. Constitution. If they should have full rights as a baby does, then so should all other children illegally in the USA for the identical reason.