Welcome to the ultimate free baby age calculator for 2025! Whether you’re wondering “how many months is my baby” or “how old is my newborn in weeks,” this lightweight, mobile-friendly tool delivers instant, accurate results. Track every milestone from day one, including adjusted ages for preemies, all without hassle.
Why Track Your Baby’s Exact Age?
Precise age tracking isn’t just for scrapbooks—it’s essential for new parents. It helps monitor growth spurts, schedule vaccinations (e.g., at 2, 4, and 6 months), and plan developmental checkups. Plus, celebrate fun milestones like the 100-day mark! Our tool handles leap years, varying month lengths, and time zones automatically.
Milestone Timeline Table
| Age Milestone | Weeks Old | Key Developments | Pro Tip |
|---|---|---|---|
| 0-4 Weeks (Newborn) | 0-4 | Reflexes, sleeping 16+ hours | Tummy time starts at 1 week |
| 1 Month | 4-5 | First smiles, head control | Track “how old is my newborn” daily |
| 3 Months | 12-13 | Cooing, grasping toys | Vaccination at 2 months—use our tool! |
| 6 Months | 26 | Rolling over, solid foods intro | Half-year bash: Calculate exact days |
| 9 Months | 39 | Crawling, “mama/dada” babbles | Pre-walking checks |
| 12 Months | 52 | First steps, waving bye-bye | Birthday planning: Weeks to months converter |
FAQs
- How many weeks is my baby? Multiply months by 4.345 (e.g., 6 months ≈ 26 weeks).
- Does it handle leap years? Yes, fully accurate for Feb 29 births.
- Future dates supported? Absolutely—project ages up to 5 years ahead.
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