The following is an excerpt.
Since the 1990s, the consensus among Jewish authorities has been that the bearing mother, not the woman who provided the gametes, is the child’s mother. But recently the pendulum has begun to swing the other way. Some rabbis in Israel now say if the donor is not Jewish, then the child is not Jewish. Opinions coming out of Israel carry a lot of weight.
“If the egg is from a non-Jew, then the DNA is from the other person,” said Rabbi Shaul Rosen, who founded A TIME, a support network for infertile Jewish couples. “In order for that child to be Jewish, it would have to go through a conversion ceremony like any other non-Jew.”
Read the full article here: What Makes a Jewish Mother