Winter is a tricky time for car seats. As a general rule, bulky clothing, including winter coats and snowsuits, should not be worn underneath the harness of a car seat. #childpassengersafety #WinterTravel Infant Car Seat Snow Suits Buckle Me Baby Winter Coats in Car Seats Are Dangerous. So, How Can You Keep Your Child Warm This Winter? What to wear baby in car seat during winter? Keep your children snug and secure in colder weather. Parents and caregivers typically dress their children in winter coats. But it's important to know that heavy coats can interfere with the proper