Parenting Β· π Global
Baby Sleep Tracker
Baby sleep guide by age with nap count, wake windows, next-sleep time, and regression alerts.
About this tool
Baby Sleep Tracker generates a same-day nap + night-sleep schedule from baby age (0~24 months) and first wake time, based on age-appropriate Wake Windows. Newborn 0~3mo: WW 45~90 min, 4~5 naps. 12mo: WW 3~4h, 2 naps. 18mo: 1 nap. Built on AAP recommended sleep durations and international pediatric sleep medicine. Flags 4-, 8-, and 18-month sleep regressions and includes swaddle / white-noise graduation tips. Free, no signup; inputs stay in your browser.
Use cases
Scenario 1
Newborn first week
For a 5-day-old, follow the 45-min WW and check the next sleep time each cycle to avoid overtiredness and crying from missed sleep cues.
Scenario 2
4-month regression
Get the 4-month regression alert plus a "drowsy-but-awake" tip set to ride out the typical 2-6 week regression.
Scenario 3
12mo 2-to-1 nap transition
Use the WW 3-4h guide to time the 2-to-1 nap transition and avoid an early switch that wrecks night sleep.
Scenario 4
Working parent night-sleep optimization
Confirm the recommended last-nap end (6 PM) and bedtime (7:30 PM) so your work schedule lines up with baby sleep.
Scenario 5
Swaddle graduation
When rolling starts (3-5mo), the tool flags an immediate stop-swaddling alert to prevent suffocation risk; transition to a sleep sack.
Features
- Auto Wake Window computation 0~24 months
- Daily nap count, times, and night-sleep recommendations
- 4-, 8-, 18-month sleep regression alerts
- Swaddle graduation and white-noise volume guide (AAP <50dB)
- Preterm corrected-age recommendation
- Bilingual KR/EN UI, mobile-optimized
Frequently asked
- Q. How precise must Wake Windows be?
- A. Β±15 min is fine. Recommendations are a starting point β follow your baby cues (eye rub, yawn) and tune over 1~2 weeks.
- Q. How long does the 4-month regression last?
- A. 2~6 weeks typically. The brain permanently shifts to adult-style cycles, so teach "drowsy-but-awake" now. If >10 weeks, consult a pediatrician.
- Q. Why are naps only 30~40 min?
- A. Infant sleep cycles are 40-50 min, so they wake at the cycle boundary. WW timing, dark room, and white noise are the top 3 fixes.
- Q. When to graduate from swaddle / white noise?
- A. Stop swaddling immediately when rolling starts (3-5mo) β suffocation risk. Keep white noise under 50dB and at least 1m away (AAP).
- Q. How do I apply age for a preemie?
- A. Use corrected age (from due date) up to 12 months, and weigh developmental signs. Enter corrected age into the tool.
Sources / references
Related guides / blog posts
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How we run it / disclaimer
This tool is advisory and does not constitute legal, tax, medical, or financial advice. All calculations and document generation run in your browser; inputs are never sent to a server. Ads follow Google AdSense policy and are kept separate from tool accuracy.