What is the ruling on standing by a child's grave and supplicating for them after burial?

It is Sunnah to supplicate for the Muslim deceased in general, and especially after burial, due to what was narrated from the Prophet, peace and blessings be upon him, that when he finished burying the deceased, he would stand over him and say: "Ask forgiveness for your brother and ask for steadfastness for him, for he is now being questioned." It is recommended to supplicate for the deceased by asking Allah to make him a predecessor and a treasure for his parents, to make him heavy in their scales, and to avert from him the punishment of the grave and the punishment of Hell.