Children's carriages generally refer to strollers. Baby strollers are a major category of travel products, including five categories: children's bicycles, children's strollers, baby strollers, children's tricycles, and children's electric vehicles. The age range for children's bicycles is 4-8 years old. When choosing a bicycle, consider the age and height of the child and choose the appropriate size, that is, the saddle height should be within the range of 435-635mm