Not a bad idea. Birth of a child is the most important event in a person's life. New born infants require pretty much full time care. Mothers, and fathers, feel an enormous compulsion to gave that care. Any responsible employer ought to be willing to cough up six weeks wages to ease the stress on their valuable employees.
There were some other ideas from Trump, mostly making child care costs deductable. You could do that, but simpler, just as effective, and requiring less paper work is to raise the exemption taxpayers already get for each dependent.