Welcome to Wonder Weeks!
Choose your baby's due date or birth date to calculate the Wonder Weeks calendar.
The name is optional. If left blank, [Our baby] will be used.
The due date is usually a more accurate reference than the birth date.
About Wonder Weeks
Calculate estimated Wonder Weeks from your baby's due date or birth date. See today's status, signs and care ideas for each period, and warning signs that need medical advice.
What are Wonder Weeks?
Wonder Weeks describes periods when a baby is going through new developmental changes in senses, movement, relationships, and language. A baby may cry more, want to be held, or have changes in sleep and feeding during these periods.
When do Wonder Weeks happen?
The estimated periods are calculated from a baby's due date or birth date. Every baby develops at a different pace, so use the dates as a general guide rather than a prediction.
How do I use the calculator?
Enter your baby's due date or birth date to see estimated Wonder Weeks periods and today's status. The due date can be a more accurate reference when you know it.
What parents may notice
A baby may ask to be held more, become sensitive in unfamiliar places, or find it harder to settle. Feeding patterns may change, and tiredness can appear sooner than usual.
What you can try at home
Reduce stimulation and repeat a familiar, quiet sleep routine. When your baby looks tired, offer rest before adding more play or new activities.
When to seek medical advice
Seek medical advice for a fever of 38°C or higher, difficulty breathing, repeated forceful vomiting, almost no wet diaper for 8 hours, refusal to feed, or crying that is very different and continues for a long time.
Important note
This service provides a parenting schedule and general guidance. It does not replace medical diagnosis. Contact a medical professional whenever your baby's condition concerns you or warning signs appear.
Frequently asked questions
What does the Wonder Weeks calculator show?
It estimates Wonder Weeks periods from the due date or birth date, shows whether today is within a period, and provides signs and care ideas for each range.
Should I enter the birth date or due date?
Use the due date when you know it because it may provide a more accurate reference. You can still use the birth date to see an estimated schedule.
Does a Wonder Weeks period mean medical care is unnecessary?
No. The schedule is only a general guide and not a medical diagnosis. Seek medical advice for concerning signs such as fever, breathing difficulty, repeated vomiting, fewer wet diapers, or refusal to feed.