Pregnancy & Childbirth
If you are pregnant, please enter your expected due date to find out approximately how many heartbeats your baby has experienced so far. Or, enter any birth date or age (in years) to estimate how many heartbeats a child or adult has experienced. (No data is collected from this page.)
Did you know that a full-term baby’s heart beats approximately 54 million times before birth?
The heart first appears about 20 days after fertilization. Once it begins to beat 22 days after fertilization, it does not rest except during the brief moment of relaxation between contractions. During an 80-year lifetime, the heart will beat more than 3 billion times!
Click a thumbnail to play video
3-4 months
Teeth are growing. Cilia is lining airways. Most of the body is sensitive to touch. 4-lobed cerebral cortex.
4-5 months
Retina has discrete layers. Cream-like substance protects the skin. Sweat glands are present. Insulin secretion begins. Speaking motion of the larynx.
Images and video courtesy of The Endowment for Human Development
