Women who had a baby during February this year at Goole and District Hospital will be asked to take part in the survey.
Bill Beaumont, chairman of the foundation trust, said: "We hope people will take the time to help us with this survey.
"Their views are vital in helping us find out how we are doing and how we can improve.
"People should be as honest as possible when filling it in, as their opinions will help us make the services we provide better."
The questionnaires are now being delivered to new mums.