The choice of a birthday gift for a girl depends on how old she is and what her interests are. If she is a relative or close personal friend, it's a good idea to ask her what she'd like for her birthday. For teen girls, clothes or gift certificates may be a good choice. For younger girls, a doll or book might be nice.
Good gifts for baby girls include a stuffed animal or other type of soft toy or book. For a girl in her late teens or that is a young adult, check discreetly with her friends for some ideas. Sometimes just paying attention to the girl's personal style or the things that she says can offer clues as to what might be the perfect gift for her.
Gifts don't always have to be material. Consider purchasing an experience, such as an appointment for a manicure and pedicure or a massage. Scheduling one or more cooking or crafting classes is also a good idea, depending on her interest in such things. Additionally, take some time to browse online for gifts that bring her to mind or that seem as if she may find them useful, fun or interesting.