What is the ruling on taking a child to the mosque?

Question:
He says: Honorable Shaykh, may Allah grant you success. Sometimes I go to the mosque with my son, who is three years old, and I have heard from some people that this action is not permissible. What is your opinion on this?

Answer:
If you are afraid for the child, if you are afraid that he will do something contrary to the rules, do not take him to the mosque. Leave him with you while you pray, or carry him. The Prophet (peace and blessings be upon him) used to carry Ummamah, the daughter of Zaynab, while he was praying. So if you are afraid for the child, there is nothing wrong with bringing him with you, but you must keep him from harming the worshippers or defiling the mosque. However, if you are not afraid for him and he has someone to hold him, do not take him to the mosque. Yes.