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Choose the candidate who meshes with you. Pick someone you'd be comfortable having in your home. Select someone who gets along with your housemates. Choose the most knowledgeable candidate.
Your doula should be a voice of reason during a hectic time and be able to calm you down when you're feeling stressed. If they're stressing you out simply during the interview, they're not a good match. Make sure you get along well with them, since you'll likely be seeing them regularly for a few months. If you can't trust someone in your home, let that be a deal breaker. Trust your own reactions, but also ask the opinion of anyone who accompanied you to the interview. To be extra sure, invest in a paid background search through your local law enforcement agency. Pregnancy and childbirth are stressful enough. The last thing you need is your loved ones bickering with or complaining about the doula. Go with the candidate who will nurture and support them, as well as you. Compare your notes with information you find from doula associations and your doctor. Check if your questions were answered thoroughly. If you really want an apprentice doula, make sure their supervisor makes up for any lack of knowledge.