Enter growth spurt details
Use the responsive grid below. It shows three columns on large screens, two on smaller screens, and one on mobile.
Example data table
| Check Date | Age | Weight (kg) | Length (cm) | Feeds/Day | Sleep Hours | Notes |
|---|---|---|---|---|---|---|
| 2026-01-10 | 3 weeks | 4.25 | 54.0 | 9 | 15.2 | Cluster feeding, short naps, extra crying. |
| 2026-02-02 | 6 weeks | 4.95 | 56.1 | 8 | 14.6 | More night waking and stronger appetite. |
| 2026-03-02 | 10 weeks | 5.55 | 58.7 | 8 | 14.0 | Settled routine with fewer fussiness signs. |
| 2026-04-01 | 14 weeks | 6.12 | 61.5 | 7 | 13.6 | Possible 3–4 month spurt pattern showing. |
Formula used
This tracker uses a practical weighted scoring model. It combines age timing, behavior changes, optional symptom checks, and recent measurement changes to estimate whether your entry resembles a common growth spurt period.
| Age in days | Age = Tracking Date − Birth Date |
|---|---|
| Age in weeks | Weeks = Age in days ÷ 7 |
| Age in months | Months = Age in days ÷ 30.4375 |
| Daily weight change | (Current Weight − Previous Weight) × 1000 ÷ Days Between Measurements |
| Daily length change | (Current Length − Previous Length) ÷ Days Between Measurements |
| Behavior score | Weighted sum of fussiness, clinginess, appetite change, sleep disruption, and checked spurt signals |
| Window proximity score | Highest when the baby’s age falls inside a stored typical spurt window, then reduced as distance increases |
| Final signal score | Signal Score = Proximity Score + Behavior Score + Growth Trend Bonuses |
This approach is useful for pattern tracking, planning routines, and organizing observations. It is not a diagnostic formula and should not be treated as clinical guidance.
How to use this calculator
- Enter the birth date and the date you want to review.
- Add current and previous weight or length if you have them.
- Enter sleep, feeding, and behavior scores using recent observations.
- Check any optional signs that match the baby’s current pattern.
- Submit the form to view the result card above the form.
- Review the graph, signal score, current window, and next typical window.
- Use the CSV or PDF buttons to save your tracking summary.
- Repeat on future dates to compare changes over time.
Frequently asked questions
1) What does this growth spurt tracker measure?
It compares age, recent measurements, feeding patterns, sleep changes, and behavior cues against common growth spurt windows. The result is a pattern estimate, not a medical conclusion.
2) Is the result a diagnosis?
No. This page is for organization and education. It helps parents spot timing patterns, but it cannot confirm illness, feeding problems, reflux, allergies, or developmental concerns.
3) Why does the tracker ask for both behavior scores and measurements?
Growth spurts are often noticed through routine changes before measurements are updated. Combining both types of data gives a fuller picture of what may be happening.
4) What if I do not know my baby’s previous weight or length?
You can still use the tracker. The result will rely more on age timing, sleep, feeds, behavior scores, and checked signals. Measurement trend bonuses will simply remain unavailable.
5) Can I use this for toddlers too?
Yes. The built-in windows extend through two years. The strongest pattern matching is usually most useful during infancy, but later routine changes can still be tracked here.
6) Why might a spurt score look low even if my baby seems fussy?
Fussiness can happen for many reasons. If age timing, appetite changes, sleep disruption, and measurement trends do not align, the tracker may show a lower spurt match.
7) How often should I update the tracker?
Many parents update it weekly or whenever routines suddenly change. Regular entries make it easier to compare patterns and notice whether a difficult phase quickly settles.
8) When should I contact a professional?
Seek professional advice if feeding drops sharply, diapers decrease, weight changes unexpectedly, sleep becomes very unusual, or you are worried about pain, illness, or dehydration.