I am not sure what you mean by getting in front of a pregnant woman. If you mean like doing a face-to-face conversation, you could try handing them a business card and give them a brief presentation about your business. I have gone to doctors' offices and placed advertisements, such as a business card flyers, in the magazines that are sitting around in the office. Other ways is to make out a survey with a list of questions, be sure to include in this survey somewhere to place their name and phone number. Ask them if they would not mind filling it out and tell them what your intentions are too. Just a couple of things here. I have some others but I don't want to bore you.

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