Expecting Better was a great book highly recommended by multiple friends that I read to learn more about pregnancy (since my wife is pregnant). Most of the book is about researching the facts about pregnancy to find out how pregnant women can best assess risk without resorting to hard rules. Emily Oster is a really valuable writer because she is a trained economist who has applied her economics background to pregnancy and parenting. I previously read Cribsheet, but didn't do much of a reflection on it--it's crazy to think I read it seven years ago!
Oster is very nonjudgmental, which is really good since pregnant women are faced with tons of judgments about their decisions to have a glass of wine, rest, exercise, you name it. So the book is filled with tons of things like her analysis of drinking coffee, which basically shows that there is really no clear evidence of any effect of caffeine intake on pregnancy health for mother or child. It is likely difficult to conduct studies because nausea during pregnancy is correlated with a low rate of miscarriage, and nauseous women usually don't crave coffee. But the hard rule of 200mg of coffee a day doesn't seem necessary. With alcohol, it appears that the real factor is speed of drinking that overwhelms the liver. Seven drinks a week may actually be safe as long as they're spread out--drinking a glass of wine slowly is unlikely to have any effects on the baby. Problems only arise when significant amounts of alcohol get into fetal tissues, but after mom's metabolization of the alcohol, that's usually not happening if it's just a little. She also does a really good analysis of raw fish: eating raw fish may make pregnant women sick, and it's worse to be sick when pregnant. But the real risk is mercury, which requires that women know the mercury levels of fish they are eating and reduce exposure by eating less fish with high mercury levels, but doesn't require full abstinence to stay safe. In fact, the mercury levels of many fish may reduce baby's IQ, but the omega-3s they have may increase IQ, so who knows?
Miscellaneous Facts:
- During the first half of a woman's cycle, her body temperature is below 98 degrees, then, the day after ovulation, it increases by about half a degree or more.
- Almost 90% of women have nausea during pregnancy, usually peaking between 8 or 9 weeks and falling off after. 50% of women report vomiting at some point in weeks 5 to 8 of pregnancy, but less than 15 to 20 percent by 17 weeks. At the worst point in pregnancy, 13% of women report throwing up 3 or more times a day.
- Airplane travel is unlikely to create enough radiation exposure to be a danger. It takes three round trip flights from New York to Tokyo to reach 1% of the level at which there is a demonstrated risk of birth defects or miscarriage. This can be relevant for women who work on airplanes, but not for the most frequent of frequent flyers.
- Kegels during pregnancy are highly effective at reducing urinary incontinence post-partum. Randomly assigned women who did 3 sets of 8 kegels twice a day for 6 seconds each had significantly lower urinary incontinence before and after delivery. Prenatal yoga also had beneficial effects, but not nearly as significant.
- Lying flat seems to have no effect on fetal health unless it makes the mother uncomfortable. Otherwise, there don't seem to be significant effects from sleeping position. The mother's discomfort may be a sign of blood flow constriction. A small minority of women feel faint from lying flat, but those who don't feel faint experience no negative effects that have been observed.
- Queen Victoria was one of the first women to use anesthesia during childbirth--inhaled chloroform for her seventh child. In the 20th century, women were sometimes given a combination of morphine and scopolamine that put them in "twilight sleep," where they experienced some pain, but forgot it. In the turn of the century, doctors administered cocaine to women in childbirth.
- Epidurals were used in two-thirds of births in the United States in 2008, although they often require use of more instruments due to the fact that epidurals make pushing harder. This can cause more tearing.
- Women who were randomly assigned a doula were half as likely to have a C-section and less likely to use an epidural.
- Eating and drinking during labor is usually prohibited, but probably doesn't need to be. The prohibition came from a time when women were put under full anesthesia, and the prohibition on eating was to avoid them throwing up during surgery and choking to death without anyone noticing. This was rare even in that situation, and today, thanks to epidurals, even less frequent. However, most women aren't hungry during the later stages of labor anyway, but if they are, they probably shouldn't be stopped from eating. Clear juices and Gatorade are a decent compromise.