The Maternity Benefit (Amendment) Act, 2017 amends the original Maternity Benefit Act of 1961, expanding benefits and redefining terms such as 'commissioning mother.' It extends maternity leave to 26 weeks for certain women and introduces provisions for adoptive mothers and those working from home. Additionally, it mandates crèche facilities in establishments with 50 or more employees, ensuring that women have access to childcare during working hours.