عن أم سلمة قالت: قال رسول الله صلى الله عليه وسلم : «لا يُحَرِّمُ من الرَّضَاعَةِ إلا ما فَتَقَ الْأَمْعَاءَ في الثَّدْيِ، وكان قَبْلَ الْفِطَامِ».
This Hadīth is evidence that breastfeeding prohibits marriage only when the breast milk reaches and enlarges the intestines. A small amount of milk that does not do this, does not forbid marriage. So, the breastfeeding that affects the permissibility of marriage is what takes place before weaning.
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