Baby: Week 3
Your heart will start beating at the end of this week!
I can hear your heartbeat!
The heartbeat is the most important vital sign of life we know of. At only 21 days, you reach a major milestone— your heart begins to beat for the first time![1] Your young heart is working, dividing into chambers, and will develop a regular rhythm soon.[2]
Did you know you used to have a tail? You’re taking on an odd shape now; you have actually developed a tail for a few weeks and look a small bit like a tadpole.[3]
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