Narrated ['Aishah (RA)]:

Allah's Messenger (ﷺ) said: "Be sure (you women) who your brothers are, for suckling is that which is the result of hunger (i.e. when milk is the child's only food)." [Agreed upon].

وَعَنْهَا قَالَتْ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ اُنْظُرْنَ مَنْ إِخْوَانُكُنَّ, فَإِنَّمَا اَلرَّضَاعَةُ مِنْ اَلْمَجَاعَةِ.‏ } مُتَّفَقٌ عَلَيْهِ [1]‏ .‏