Mr. Dad: My girlfriend is about a month pregnant—her second baby but my first. I’m concerned because she’s nauseated and vomiting all day long. She calls it “morning sickness” and says she had the same thing with her first baby and that it’s normal. But doesn’t the name imply that the problems should be limited to the morning? Either way, what can I do to help?
A: Given that your girlfriend has been through this before and says it’s normal, take her word for it. As the pregnancy develops you’ll have plenty of other things to worry about, so let this one go.
The name “morning sickness” is a little catchier—but less accurate—than “all day long sickness,. As you’ve noticed, the heartburn, queasiness and throwing up are by no means limited to the actual morning. Between half and 85% of pregnant women get morning sickness but no one’s quite sure what causes it. Some researchers believe that it’s the pregnant woman’s reaction to changing hormone levels, in particular human chorionic gonadotropin (hCG), which is produced by the placenta and is the same stuff that’s picked up by home pregnancy kits. Many women with morning sickness also have food aversions, especially to eggs, fish, meat, and poultry—all of which can go bad quickly and may carry disease. That has led a number of researchers, including Samuel Flaxman, Margie Profet, and Paul Sherman to speculate that morning sickness is the body’s way of protecting the baby-to-be from food-borne substances that could cause a miscarriage or birth defects.