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.
A lot of travel operators offer for holiday travel discounts, special prices for children or free travel for children.