وَعَنْ أُمِّ سَلَمَةَ رَضِيَ اَللَّهُ عَنْهَا
قَالَتْ: قَالَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«لَا يُحَرِّمُ مِنْ اَلرَّضَاعَةِ إِلَّا مَا فَتَقَ اَلْأَمْعَاءَ، وَكَانَ قَبْلَ اَلْفِطَامِ»
The Messenger of Allah (sallallahu alayhi wa sallam) said: “The suckling that makes marriage unlawful is that which reaches the intestines (i.e. nourishes the child), and is taken before (two years) time of weaning.”.