How many months old can a newborn sit in a car seat?

[AuroraRose]

Infants can fully sit up at seven months old, so they can only use car seats after seven months. A car safety seat refers to a seat installed in a car, designed with ergonomic features that match children's body shapes, providing them with a sense of security and being surrounded. The following is an introduction to child safety seats: 1. A car child safety seat, also known as a Child Restraint System (CRS), is a seat specifically designed for children of different ages, installed in cars to effectively improve children's riding safety. 2. According to European Regulation ECE-R44/03, a child safety seat is defined as: a child safety protection system that can be fixed to a motor vehicle, consisting of safety belt assemblies with buckles or flexible components, adjustment mechanisms, accessories, etc., and may include additional devices such as portable cribs, infant carriers, auxiliary seats, or collision protection devices. 3. In the event of a car collision or sudden deceleration, it can reduce the impact on children and limit their body movement to minimize injuries, ensuring their riding safety.