Baby Age Calculator
How many weeks and days old is your little one? Enter their date of birth below.
Uses today's date on your device. Future birth dates are not accepted.
The date stays in this browser tab. It is not saved or sent to Newbornly.
Why calculate your baby’s age in weeks?
In the first months, parents often refer to a baby’s age in weeks. This calculator shows elapsed full weeks and remaining days using today’s date on your device.
Age is just one part of your baby’s story. If you need health or developmental guidance, ask a qualified healthcare professional.
Track the rest of your routine with Newbornly
Newbornly helps you log baby sleep, feeding and diapers in one place. Available for iPhone.