My Baby - Week by Week Pregnancy
Week 5 - A Beating Heart
This week, your baby is no bigger than the tip of a pen, but its little heart begins to beat and its blood vessels complete a circuit, making the circulatory system the very first functioning organ system. An ultrasound
may be able to detect the movement of your baby's little beating heart, although it will still be a few more weeks before it's loud enough for you to hear.
Learn More: Ultrasound
How is your body changing this week? Find out: My Pregnant Body Week 5
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