Islam is keen on the safety of Muslims and has guided them to what presents good care of children. This includes the exhortation to provide good suckling. In this Hadīth, Usāmah ibn Zayd (may Allah be pleased with him) relates that a man came to the Prophet (may Allah's peace and blessings be upon him) and said: "I practice coitus interruptus with my wife." Coitus interruptus is practiced by removing the male sex organ out of the woman's vulva before ejaculation, and the man ejaculates outside the vulva, to prevent pregnancy. The Prophet (may Allah's peace and blessings be upon him) asked him: For what reason do you do this act? The man said: "I fear for her child", who suckles from her. This is because if she gets pregnant, her milk will be spoiled, and the body of the baby will become unsound and weak. Or he meant the famous notion among the Arabs that copulation damages milk and that such milk will be a malady and if the baby drinks it, he will become ill. So, he feared that he would be thin and unwell. Thereupon, the Prophet (may Allah's peace and blessings be upon him) said to him: "If this was harmful" - copulation or pregnancy during the period of suckling - "it would harm the Persians and the Romans", for the women of the Persians and the Romans suckle their babies while they are pregnant. So, if pregnancy or copulation during the period of suckling was harmful, it would harm their children. But the reality belies that, as they do not care to avoid this matter and their children are in good condition, and you are like them in this regard..