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![]() ![]() ![]() ![]() ![]() ![]() ![]() First | Previous | Next | Last | | Index | Home Slide 11 of 49 Milestones of human development begin early. For example, the human heart beings to form 18 days after conception and exhibits a measurable heart beat at 21-24 days.1 The brain begins to form at this time2 and produces measurable brain waves at day 40.3 References
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