What’s the change of mind?
He said pregnancy is wonderful for the mother and father. I’m sure he felt that way then and that way now.
He said pregnancy is an inconvenience for business. I’m sure he felt that way then and feels that way now.
The problem is requiring business to pay women to not work while they are pregnant.
I realize it seems asymmetrical. But in terms of society, the U.S. has in the past had a practice of holding a job for a guy who serves in the military. Also, a married pregnant woman is part of a wage-earning family, so the man also gets a social benefit from his wife having a pregnancy stipend. This is very lopsided in a small company that may not have an equal number of child-bearing family men's wives vs fertile women employees; but in a large company, it may be a wash from male employees whose non-company wives have babies, but the men continue to come to work instead of taking some time to bond with the baby and readjust the household.
Trends in large corporations since Trump gave this interview are for fathers also to take some time off for a newborn.