Sayyiduna Uthman bin Abi al-As (may Allah be pleased with him) said: When the Messenger of Allah (peace and blessings be upon him) sent me to Thaqif, he said: "O Uthman, keep the prayer short, and measure the people by the weakest of them, for among them are the weak, those with needs, pregnant women and nursing women. I myself hear a child crying and shorten (the prayer)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8347