Baby Age Calculator
Track your baby's age milestones and development stages from birth to 24 months
Baby Age & Milestone Calculator
Enter your baby's date of birth
Age Conversion Quick Reference
Weeks to Months
Formula: Weeks ÷ 4.345 = Months
• 4 weeks ≈ 0.9 months
• 8 weeks ≈ 1.8 months
• 12 weeks ≈ 2.8 months
• 24 weeks ≈ 5.5 months
Months to Weeks
Formula: Months × 4.345 = Weeks
• 1 month ≈ 4.3 weeks
• 6 months ≈ 26 weeks
• 12 months ≈ 52 weeks
• 18 months ≈ 78 weeks
Key Development Milestones
3 Months
Holds head up, social smiles
6 Months
Sits without support, first foods
12 Months
First birthday, may walk
18 Months
Runs, climbs stairs
Parenting Tips
Every baby develops at their own pace - these are general guidelines
Track milestones for pediatric checkups and vaccination schedules
Premature babies may reach milestones based on adjusted age
Consult your pediatrician if you have concerns about development
Understanding Baby Age and Development
Why Track Baby Age?
Tracking your baby's age is crucial for monitoring healthy development, scheduling vaccinations, and ensuring proper nutrition. The first few years are critical for brain development and establishing important milestones.
Important Uses
- •Vaccination schedules and pediatric checkups
- •Baby formula and feeding requirements
- •Medication dosages (like infant Tylenol)
- •Developmental milestone tracking
Age Calculation Methods
Chronological Age
Actual age since birth date. Used for most medical and developmental assessments.
Adjusted Age
For premature babies, calculated from the due date rather than birth date.
Gestational Age
Age calculated from conception date, important for newborn care.