The Messenger of Allah ﷺ said, "There is no fosterage except what fills the intestines."
حدثنا حرملة بن يحيى حدثنا عبد الله بن وهب أخبرني ابن لهيعة عن أبي الأسود عن عروة
أن رسول الله ﷺ قال لا رضاع إلا ما فتق الأمعاء
No references are available.
[Sahih]. Ibn Lahia narrated using an (an ambiguous form of transmission), hadith no. 330 as far as I know, and his hadith has corroborating narrations, among them this hadith. This hadith was also narrated by Tirmidhi, no. 1152, from the aforementioned source, and Busiri said that in its chain is Ibn Lahia, regarding the hadith of Umm Salama, and he said, hasan sahih, and by this the hadith is confirmed sahih.