Newborn Sleep Calculator
Find out when your newborn's next feed window is and how much total sleep they need based on age. Helps exhausted parents plan their day.
Part of our Health Calculators collection.
Newborn Sleep Calculator
Free online calculator
Results update automatically as you type
How to Use This Calculator
- 1
Enter baby's age in weeks.
- 2
Enter last feed time.
- 3
See next feed window and daily sleep totals.
Newborn Sleep & Feed Guidelines
Feed intervals by age: 0–4 weeks: every 2–2.5 hours (8–12 feeds/day) 4–8 weeks: every 2.5–3 hours 8–12 weeks: every 3–3.5 hours 12+ weeks: may stretch to 3.5–4 hours Total sleep needed: Newborn: 16–17 hrs | 1–2 mo: 15–16 hrs | 3–4 mo: 14–15 hrs
Example Calculation
Example: 4-week-old, last fed at 2:00 AM
Inputs
ageWeeks: 4lastFeedTime: 2:00 AM
Result
Next feed: 4:00–4:30 AM
4 weeks: 2–2.5 hour intervals. Next window: 4:00–4:30 AM.
Frequently Asked Questions
When will my baby sleep through the night?
Most babies can sleep 5–6 hour stretches by 3–4 months, and 8–10 hours by 6 months. This varies enormously — some sleep through earlier, many much later. Avoid comparing to other babies.
Is it safe to let a newborn sleep longer?
For the first 2–4 weeks, wake a newborn who hasn't fed in 4 hours (by day) or 5 hours (by night) until birth weight is regained. After that, let a healthy, thriving baby lead.