Toyota prius Owner's Manual page 122

1-4. Adjustable components (seats, mirrors, steering wheel)
CAUTION
 Pregnant women
 People suffering illness
Obtain medical advice and wear the seat belt in the proper way. (P. 118)
 When children are in the vehicle
Do not allow children to play with the seat belt. If the seat belt becomes
twisted around a child's neck, it may lead to choking or other serious injuries
that could result in death.
If this occurs and the buckle cannot be unfastened, scissors should be used
to cut the belt.
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Obtain medical advice and wear the seat
belt in the proper way. (P. 118)
Women who are pregnant should position
the lap belt as low as possible over the
hips in the same manner as other occu-
pants. Extend the shoulder belt com-
pletely over the shoulder and position the
belt across the chest. Avoid belt contact
over the rounding of the abdominal area.
If the seat belt is not worn properly, not
only the pregnant woman, but also the
fetus could suffer death or serious injury
as a result of sudden braking or a colli-
sion.