Will a child be rewarded for the deeds he performed in his childhood after reaching puberty?

A child is rewarded for the deeds he performs before reaching puberty, as it was narrated that the Prophet, may Allah bless him and grant him peace, said concerning a child's Hajj: "Yes, and you will have a reward for it," and due to his saying: "Command your children to pray when they are seven, and beat them for it when they are ten."