Not that cute, considering he was wrong
Immunologically, the fetus is part of a graft/host relationship and that's the way it should be considered -- a reproductive graft.
The Connecticut Supreme Court got it right in Sandoval when they ruled that the fetus is part of the woman.
"Thus, immunologic changes during and after pregnancy highlight the basis for its examination as an immunologic challenge for tolerance of the mother to the fetal allograph. As such, Nelson views pregnancy as a graft-versus-host condition. She outlined similarities between systemic sclerosis and chronic graft-versus-host features, noting that scleroderma in parous women occurs at a much later age and is associated with the long-term persistence of fetal cells."
God knows