Is there a way for a woman to breastfeed an infant not of her own ?

Yes: The term "wet nurse" applied to those whose primary employment in the eighteen hundreds was as surrogate to women who could not or chose not to breast feed their kids.It happens occasionally today, mostly within close nit family systems.Docs can induce lactation in those wanting to do so.

Yes: This was more common in days past when women who regularly fed another child were called "wet nurses" today, many women work to develop the ability to partially breast-feed an adopted baby. Sometimes, friends babysitting each others infants, may nurse a friend's baby and vice versa. This is popular in varying degrees around the world.