Enter your baby's date of birth to find their exact age in days, weeks, and months — plus an overview of upcoming developmental milestones.
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Milestones are typical age ranges and vary between children. They are not a substitute for professional assessment.
This calculator provides estimates only. For concerns about your child's development, always consult a healthcare professional.
The calculator uses your baby's date of birth to estimate their age in days, weeks, months and years. It can also show corrected age if your baby was born early.
Corrected age adjusts for how many weeks early a baby was born. It is often used when looking at development in babies born prematurely, especially during the first two years.
Both can be useful. Weeks are helpful in the newborn stage, while months become more practical as your baby grows. Healthcare professionals often use the format that best matches the developmental question.
No. Milestones are typical age ranges, not strict deadlines. Babies develop at different speeds, and premature babies may be assessed using corrected age.
Ask for advice if your baby loses skills, seems unusually floppy or stiff, is not feeding well, is not responding to sound or interaction, or if your instincts tell you something is not right.