Muwatta Imam Malik Book of Suckling, Hadith 16

Yahya related to me from Malik that Muhammad ibn Abd ar-Rahman ibn Nawfal said, ''Urwa ibn az-Zubayr informed me from A'isha umm al- muminin that Judama bint Wahb al-Asadiyya informed her that she heard the Messenger of Allah ﷺ say, 'I intended to prohibit ghila but I remembered that the Greeks and Persians do that without it causing any injury to their children.' "
Malik explained, "Ghila is that a man has intercourse with his wife while she is suckling."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ نَوْفَلٍ، أَنَّهُ قَالَ أَخْبَرَنِي عُرْوَةُ بْنُ الزُّبَيْرِ، عَنْ عَائِشَةَ أُمِّ الْمُؤْمِنِينَ، عَنْ جُدَامَةَ بِنْتِ وَهْبٍ الأَسَدِيَّةِ، أَنَّهَا أَخْبَرَتْهَا أَنَّهَا، سَمِعَتْ رَسُولَ اللَّهِ ﷺ يَقُولُ " لَقَدْ هَمَمْتُ أَنْ أَنْهَى عَنِ الْغِيلَةِ حَتَّى ذَكَرْتُ أَنَّ الرُّومَ وَفَارِسَ يَصْنَعُونَ ذَلِكَ فَلاَ يَضُرُّ أَوْلاَدَهُمْ " .