In fact, over 85% of the women of Argentina self-describe themselves as being of European descent.
There are also quite a few Argentine women descended from Middle Eastern immigrants, particularly Lebanese and Syrian Christians.
Today it is more common for women to have careers (although still a significant minority) so couples may delay having children or the father may stay home with the kids when they do (again very rare, but slowly becoming more common).
Many couples try to buy a house and slowly expand it over time as their family grows as moving is not real common once a house is purchased.
About 3% of the population is descended from the indigenous people and there is even a small population of Asian-Argentines.