Why the downvotes? He was just RTFM-ing me, which is fine as he's got a point.
"A woman can only act as a wet-nurse if she is lactating. It was once believed that a wet-nurse must have recently undergone childbirth. This is not necessarily true, as regular breast suckling can elicit lactation via a neural reflex of prolactin production and secretion. Some adoptive mothers have been able to establish lactation using a breast pump so that they could feed an adopted infant."
"A woman can only act as a wet-nurse if she is lactating. It was once believed that a wet-nurse must have recently undergone childbirth. This is not necessarily true, as regular breast suckling can elicit lactation via a neural reflex of prolactin production and secretion. Some adoptive mothers have been able to establish lactation using a breast pump so that they could feed an adopted infant."