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Q&A: Frozen embryos, third-hand smoke, miscarriage, left-handedness, and stretching [Emily Oster, ParentData]

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  • Are there drugs in the frozen embryo transfer process that would legitimately interfere with breastfeeding? – The drugs that are typically used in these cycles could affect your breast milk supply. However, considering how far along you are in breastfeeding, the effects are likely to be small. It will certainly be recommended that you stop breastfeeding, though, just because we do not have much data about this situation.
  • Would breastfeeding, given my period has been back for 12 months, lower my chances of successful implantation? – We can extrapolate the answer to this question from the question of getting pregnant while nursing in general. In general, breastfeeding acts as birth control by preventing ovulation. Breastfeeding is not contraindicated during pregnancy, including early pregnancy (i.e. implantation). So this is fine.
  • If I do have to defer implantation, is there any reason for me to stick to my “I don’t want to be pregnant after 40,” given they are eggs from a younger age? – No. In the immortal words of Matthew McConaughey in *Dazed and Confused*: “That’s what I love about these high school girls [read here: frozen embryos], man. I get older, they stay the same age.” You’ve got a little breathing room.

Published February 24, 2023
Visit ParentData to read Emily Oster’s original post Q&A: Frozen embryos, third-hand smoke, miscarriage, left-handedness, and stretching

Prenatal Testing Deep Dive [Emily Oster, ParentData]

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• Dr. Aaron Carroll is a professor of pediatrics at Indiana University School of Medicine and a health policy researcher.
• He has written extensively on the evolution of prenatal testing, including cell-free fetal DNA testing, amniocentesis, CVS tests, and PGT.
• He explains that cell-free fetal DNA testing is extremely accurate for detecting the primary trisomies (21, 13, 18), with a 99.4% detection rate and a 0.1% false-positive rate.
• Invasive testing is also highly accurate, but carries a small risk of miscarriage.
• Ultrasound findings rarely provide much information if cell-free fetal DNA testing has already been done, and no additional information if invasive testing has been done.

Published January 30, 2023
Visit ParentData to read Emily Oster’s original post Prenatal Testing Deep Dive

Four New Studies on Pregnancy That Didn’t Get the Attention They Deserve [Emily Oster, ParentData]

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  • Four new studies on pregnancy were discussed, which examine group prenatal care, COVID vaccines and pregnancy, and preterm birth.
  • Group prenatal care did not lower the rate of preterm birth overall or within Black participants.
  • COVID vaccination during the second trimester of pregnancy provides antibody protection through six months.
  • High-grade chronic inflammation of the placenta increases the risk of recurrent preterm birth by 37%, and a short cervical length within the first 24 hours after birth predicted a recurrence of preterm birth.

Click HERE for original. Published December 22, 2022

How Much Aerobic Exercise Is Safe During Pregnancy? [Emily Oster, ParentData]

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  • Aerobic exercise is generally safe during pregnancy; maximum heart rate should not exceed 150 bpm.
  • Fetal heart rate often increases with maternal exercise, but usually not into a zone of concern.
  • Exercise has benefits for maternal health, but there is a slightly higher risk for injury due to loosened ligaments.

Click HERE for original. Published December 1, 2022

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