Child Passes:

Child passes are available in almost all categories of rail passes, including rail/drive passes. Child fares are generally 50% of adult fares, although this may vary (travelers are advised to check the terms of the passes). In some cases children travel free with adults. For example, BritRail passes allow 1 free child per adult and half price for each additional child for those specifically requesting the BritRail family pass. Be sure to check for special promotions on the passes you will be ordering.