What was the cause of death of the Messenger of Allah's sons (may Allah bless him and grant him peace)?

The death of the Prophet Muhammad's children, peace and blessings be upon him, was natural. Al-Qasim, Abdullah, and At-Tayyib died in Mecca before the prophethood, and Ibrahim died in Medina in the ninth year [of Hijra]. The sun eclipsed on the day of his death, and people thought that this was because of his passing. The Prophet, peace and blessings be upon him, denied that, explaining that the sun and the moon are two signs among the signs of Allah; they do not eclipse for anyone's death or life.