Your birthday is the best, most awesome day in the world. It marks an exact number of years since the day you were born. So our fan Megan S. asked, how many people share your birthday? Then our fan Paige O. asked us, how many babies are born each day? They’re really asking the same thing. Every day about 373,000 babies are born! That comes to about 260 babies every minute, and the number keeps going up. So lots of people share your birthdate, and many of those people even have the same exact time as yours listed on their birth certificates. But don’t worry — you still get your own cake.
Wee ones: How many years ago were you born? Count up to your age!
Little kids: How old will you be on your next birthday? Bonus: What’s the month and date of your birthday? How many months until your next birthday?
Big kids: Which do you think is closer, your last birthday or the birthday that’s coming up? Bonus: If it’s a slow day and only 240 babies are born in 1 minute, how many babies are born each second? (Reminder if needed: there are 60 seconds in a minute.)
The sky’s the limit: If 373,000 babies (including you) were born the day you were born, how many people share your exact birthdate?
Wee ones: Different for everyone…and count 1, 2, 3…to your age.
Little kids: Different for everyone: add 1 to your age today. Bonus: Different for everyone again. If you read this in March and your birthday is April, that’s about 1 month away; May is 2 months away; and so on.
Big kids: For birthdays from now up to and including October 18, your next birthday is closer (if you read this on April 19). For birthdays since last October 19 up to today, your last birthday is closer. Bonus: 4 babies every second!
The sky’s the limit: 372,999 other people.
Laura Bilodeau Overdeck is founder and president of Bedtime Math Foundation. Her goal is to make math as playful for kids as it was for her when she was a child. Her mom had Laura baking before she could walk, and her dad had her using power tools at a very unsafe age, measuring lengths, widths and angles in the process. Armed with this early love of numbers, Laura went on to get a BA in astrophysics from Princeton University, and an MBA from the Wharton School of Business; she continues to star-gaze today. Laura’s other interests include her three lively children, chocolate, extreme vehicles, and Lego Mindstorms.