The midwife may need to use a speculum:

The speculum is made of either metal (reusable) or plastic (disposable). It has two short blades that are curved across their width (Fig. 28.1). When the speculum is closed the blades close together, but when it is opened they separate to press against the vaginal walls. At one end there is a circular opening through which the vagina and cervix can be visualised and swabs inserted when required. Attached to this end are the handles that open and close the speculum by means of a screw mechanism. When the handles are apart the blades are closer together. To open the blades, bring the handles together. When inserting the speculum, ensure it has been introduced far enough into the vagina otherwise it will be difficult to visualise the cervix and take a swab (Hardy 2007).