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! Your young heart is working, dividing into chambers, and will develop a regular rhythm soon.
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.
Langmans Medical Embryology, Ninth Edition, TW Sadler, 2003find out more
Babycentre discusses Week 5find out more
What to expect discusses Week 5find out more