Whether it’s a job or a calling, surrogacy numbers are rising in the United States and across the world. Holly Baxter reports on what it’s really like to carry somebody else’s baby, according to the women who do it — as well as the evolving research on what the genetic implications might be W hen Sammi Itatani went for her seven-week scan, she assumed she was carrying a routine pregnancy. She’d transferred one embryo during IVF, and had gotten a positive pregnancy test not long afterwards. She