That is speculation. Lactose is present in all mammalian milk.
Lactose intolerance and the breastfed baby
Lactose is the sugar in all mammalian milks. It is produced in the breast and is independent of the mother's consumption of lactose. It is present in a constant concentration in breastmilk.
Primary (or true) lactose intolerance is an extremely rare genetic condition and is incompatible with normal life without medical intervention.
You brought this up before and I patiently explained to you that this is a different phenomenon.
The mutation we speak of in adult lactose intolerance is one that allows persistence of the enzyme when the normal enzyme is degraded in adults.
Why do you insist on bringing this up again, as if you are making a valid criticism?