I have only encountered it once in my career (over 1300 births plus lots of prenatal class parents, 35 years in the birth biz). The baby with polycythemia I worked with was very ill with it, she was hospitalized on Day 2 of life and had some blood removed which improved her condition right away. She remained in hospital for about 7 days. She had Down syndrome and polycythemia can be part of the presentation with Down. A very good friend who is also a doula has a daughter with Down Syndrome and her story is almost exactly the same as the baby girl in my practice i.e. polycythemia after a gentle homebirth which was treated well in hospital. Both these baby girls were discharged from hospital much faster than the medical professionals involved expected.
I am a believer in leaving the birth of the placenta for a full 30 minutes (or longer). If the placenta births before 30 minutes, it is rare, and it means that the mother pushed it out without any advice from me. In my work, the cord is clamped and cut only after the placenta is out. With the one exception of the girl with Down Syndrome, I do not see cases of polycythemia, jaundice or any of the other dire predictions that the medical profession warns about with leaving the cord to pulse until it stops naturally. Fear of polycythemia is no justification for continuing on with amputating the placenta prematurely. Waiting only two or three minutes to clamp the cord is still an assault on the baby.
Remember, scissors, hemostats and cord clamps have only been invented for a short time in human history. Before that, people waited till the placenta came out naturally before doing anything about the umbilical cord. When the baby is adjusting to life with the cord intact, the blood goes back and forth through the two arteries and one vein in the cord. . . it isn’t just going in to the baby from the placenta, it’s coming out, too, in correct balance for that baby’s anatomy. The placenta was trusted to sustain the well being of the baby in every way for nine months, I am certain that it’s okay to let it keep performing that function for another 30 minutes.
(This is a comment from Facebook that I made in response to a query about cord clamping. The women who birth at home are not induced, not medicated and receive no routine injection of pitocin after the birth. They are healthy women with full term babies, for the most part.) Gloria Lemay