Free Baby Tool
Baby Age Calculator
See your baby's exact age in months, weeks and days – plus key milestone dates like 100 days and their half birthday.
Your baby is
That's over 5 years — worth double-checking the birth year if this doesn't look right.
For Medical Forms
Total Days
Key Milestones
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Your dates are calculated and saved in your browser only. Nothing is sent to our servers.
Disclaimer: This tool is for everyday guidance only and doesn't replace medical advice. If you're concerned about your baby, contact NHS 111 or your GP.