Hadith on Customs: The Prophet considers customs of other nations

Judamah bint Wahb reported: The Messenger of Allah, peace and blessings be upon him, said, “I considered forbidding intercourse with a breastfeeding woman, until it occurred to me that the Romans and Persians do that and it does not harm their children.

Source: Ṣaḥīḥ Muslim 1442

Grade: Sahih (authentic) according to Muslim

عَنْ جُدَامَةَ بِنْتِ وَهْبٍ الْأَسَدِيَّةِ قالت قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَقَدْ هَمَمْتُ أَنْ أَنْهَى عَنْ الْغِيلَةِ حَتَّى ذَكَرْتُ أَنَّ الرُّومَ وَفَارِسَ يَصْنَعُونَ ذَلِكَ فَلَا يَضُرُّ أَوْلَادَهُمْ

1442 صحيح مسلم كتاب النكاح باب جواز الغيلة وهي وطء المرضع وكراهة العزل