With Deutsche Bahn children 6 years up to 14 years pay nothing if they are accompanied by their parent or grandparents. Children under 14 years travelling alone pay half price for a ticket.
In local public transport there are usually children's tickets at discounted prices.
In public transportation services children under 6 years usually travel free. For children up to 15 years, school children, apprentices and students there are travel cost reductions. All lot of travel operators offer for holiday travel discounts, special prices for children or free travel for children.