How much are the tickets for children and infants on the Beijing-Shanghai fast train?

It depends on the height of your children. If the child is under 1.2 meters high, it is free of charge with no seats. With a height of 1.2 to 1.5 meters, children can occupany a seat with half price. However, if your child is more than 1.5 meters high, you need to pay the full price.