Male so-called 'lactation'.
It is not lactation. Lactation is what female mammals do in response to the hormonal changes resulting from giving birth. It is supported and maintained by the physical action of infant suckling or, to a lesser extent, manual pumping. It adapts to the needs of the growing infant, without any conscious actions from the mother. It fully supports the needs of the infant.
When a male secretes a milk-like substance from his nipples it is not lactation. When deliberately induced it is not a natural response to hormonal changes, but a side-effect of medications. When it happens spontaneously, without drug teatment, it requires medical investigation because it is indicative of a medical condition such as a pituitary tumour. There is a medical term for this: galactorrhoea.
Talking about 'male lactation' is like using 'gender-affirming pronouns' or incorrect grammar such as 'transwomen' - the slippery slope to equivalence with what it is absolutely not, the slippery slope towards female erasure.
Galactorhoea.