Michigan's Child Passenger Safety Law requires:
Children younger than age 4 to ride in a car seat in the rear seat if the vehicle has a rear seat. If all available rear seats are occupied by children under 4, then a child under 4 may ride in a car seat in the front seat. A child in a rear-facing car seat may only ride in the front seat if the airbag is turned off.
Children to be properly buckled in a car seat or booster seat until they are 8 years old or 4-feet-9-inches tall. Children must ride in a seat until they reach the age requirement or the height requirement, whichever comes first.