Final answer:
Children should be at least 13 years old to sit in the front seat, with considerations for local laws and developmental maturity. Always consult local regulations and car's safety manual for specific guidelines.
Step-by-step explanation:
The question asks at what age a child can sit in the front seat of a vehicle. This decision can often depend on the laws of the region and the specific guidelines provided by that region's transportation authority. However, many safety experts and guidelines suggest that children should be at least 13 years old before sitting in the front seat. It is always crucial to consult local laws and the car's manual, as each state may have different regulations and each car manufacturer might have specific recommendations or child safety features.
Regarding developmental milestones, it's important that a child has reached certain points of muscle strength and coordination. For instance, sitting without support is a milestone typically achieved by 90% of babies between 5 and 9 months old. When considering car safety though, factors such as height, weight, and developmental maturity, rather than age alone, are essential to ensure the seat belts fit properly and the child is protected in the event of a crash.