How to wear a seat belt while pregnant

What does the evidence say about seat belt use during pregnancy?

1. A crash-simulation study of pregnant drivers found the placental abruption area was about 7.0 percent with a correctly positioned lap belt across the lower abdomen and hip bones, versus 36.3 percent when the belt sat at the umbilicus instead, at the same 40 km/h crash speed, and concluded that a correctly positioned belt would likely not lead to negative fetal outcomes. 1
2. The recommended position is the shoulder belt across the middle of the chest and the lap belt across the hips below the abdomen, but survey data cited in this analysis found real gaps in practice: 13 percent of pregnant respondents in one study wore the belt incorrectly, and 39 percent in another could not correctly identify where it should sit. 2
3. In the same crash-database analysis, wearing a seat belt was associated with substantially lower odds of any serious injury (adjusted odds ratio 0.35) compared with being unbelted, with especially strong protection against brain injury. 2
4. A trauma-center review of 157 pregnant crash patients found 99 percent had worn a seat belt and 85 percent came away with no or only minor injuries; vehicle speed, not seat belt use, was the factor most associated with serious injury. 3
5. Placental abruption after trauma can occur without significant vaginal bleeding or regular contractions, so a calm first hour after a crash doesn't rule it out; persistent abdominal tenderness, contractions, abnormal fetal monitoring, unstable vital signs, or significant bleeding are the findings that call for hospital evaluation, and fetal monitoring is typically recommended after any notable trauma regardless of symptoms. 4

Is seat belt use safe in each trimester?

• First trimester. Your bump isn't in the way yet, so this is a good time to build the habit: lap belt low across the hip bones, shoulder belt across the chest, both snug.
• Second trimester. As your belly grows, the lap belt needs more deliberate positioning below it rather than across it. Recline the seat back slightly and, if your car allows it, tilt the steering wheel toward your chest rather than your belly.
• Third trimester. The belt still goes low across your hips, not over your belly, right up to delivery; skipping it is the real risk, not wearing it. If you're in any collision, even a low-speed one, get checked, since some placental injuries don't cause obvious bleeding or pain right away.