Certification is not universally required but is offered by several organizations and is often expected by clients and by hospitals or birth centers. Many families ask about training early, so stating your certification and experience clearly on your website answers a common question.
Certification is not universally required to practise, and it is offered by several organizations with differing curricula and standards.
Whether it matters practically depends on context:
Requirements and expectations vary by organization, facility and jurisdiction, so confirm what applies in your area rather than relying on general guidance.
From a marketing standpoint, whatever your training is, state it clearly on the website along with your experience. A doula with substantial experience and no certification should say so plainly with the experience foregrounded, since ambiguity invites the question rather than answering it.
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