From Sahih Bukhari (Hadith 868):
Narrated `Abdullah bin Abi Qatada Al-Ansari:My father said, "Allah's Messenger (ﷺ) said, "Whenever I stand for prayer, I want to prolong it but on hearing the cries of a child, I would shorten it as I dislike to put its mother in trouble
Reference: Bukhari 868