Answer: Texas law requires all child safety seat systems to be installed according to the manufacturers' instructions. Local laws declare that unless their height exceeds 4 feet 9 inches kids under 8 years must be strapped into a Child Passenger Safety Seat System.Texas car seat laws for 2024 outline specific age, height, and weight rules for child safety seats. Under Texas law, any child who is younger than age 8 must ride in a "child passenger safety seat system" unless the child is taller than 4 feet, 9 inches. Texas Seat Belt Laws. (2) transporting a child in a vehicle in which all seating positions equipped with child passenger safety seat systems or safety belts are occupied. Texas law regarding the use of car seats and booster seats can be found in Section 545.412 of the Texas Transportation Code. Alaska, Rear-Facing Car Seat: Under 1 yr, or under 20 lbs. Forward-Facing Car Seat: 1-3 years, and 20 lbs or heavier. If they're between ages 1 and 3 and weigh more than 20 pounds, children still have to be in a child restraint.