i.e birth doula certification, postpartum doula certification, CPR, CLC, IBCLC, CBE, etc.
i.e How long have you been a doula? How many families have you served as a birth professional? How long have you been offering education classes? What hospitals do you have experience working at? etc.
i.e extremely allergic to animals of any sort, won't work in a hospital setting, won't provide services to families giving birth outside of the hospital, will only support families of a specific religious or cultural belief, etc.
If you've been serving as a birth professional, please use previous clients as 2 of the 3 references.