Baby Due Date Countdown — Track Your Pregnancy Week by Week

Your due date is 280 days from your last menstrual period. Set it in the countdown timer and watch the weeks tick down. Below: trimester-by-trimester milestones, what to prepare when, and the numbers that matter during pregnancy.

How to Set Up Your Due Date Countdown

1. Calculate your due date: Use the date calculator — add 280 days to the first day of your last period
2. Set the countdown: Enter that date into the countdown timer
3. Bookmark it: Check weekly to see your progress
4. Share the link: Family and friends can follow the same countdown

Pregnancy Timeline — Week by Week Milestones

First Trimester (Weeks 1-12)

Week	Baby Development	What to Do
4-5	Heart starts beating, embryo is grain-of-rice sized	Confirm pregnancy, start prenatal vitamins
8	All major organs forming, about 1 inch long	First prenatal appointment, hear heartbeat
10	Fingers and toes forming, baby moves (too small to feel)	Genetic screening options discussed
12	Baby is 2.5 inches, looks like a tiny human	End of highest miscarriage risk period, announce to family?

Second Trimester (Weeks 13-26)

Week	Baby Development	What to Do
16	Baby is 4.5 inches, can make facial expressions	Start feeling movement (quickening)
20	Halfway point — baby is ~10 inches, banana-sized	Anatomy scan ultrasound, learn gender if desired
24	Baby weighs ~1.5 lbs, lungs developing	Viability milestone — survival possible if born now
26	Eyes open, baby responds to sounds and light	Start nursery planning, register for baby shower

Third Trimester (Weeks 27-40)

Week	Baby Development	What to Do
28	Baby weighs ~2.5 lbs, brain growing rapidly	Third trimester visits every 2 weeks
32	Baby is ~4 lbs, practicing breathing movements	Finalize birth plan, preregister at hospital
35	Baby is ~5.5 lbs, lungs nearly mature	Pack hospital bag
36	Baby is ~6 lbs, dropping into pelvis	Nursery should be ready, car seat installed
37	Full term begins — baby is ready anytime	Weekly appointments, watch for labor signs
40	Due date — average baby is 7.5 lbs, 20 inches	Could come today, or up to 2 weeks later

The Numbers

Metric	Number
Average pregnancy length	280 days (40 weeks) from LMP
First trimester	Weeks 1-12 (84 days)
Second trimester	Weeks 13-26 (98 days)
Third trimester	Weeks 27-40 (98 days)
Babies born on exact due date	~5%
Babies born within 1 week of due date	~50%
Babies born within 2 weeks of due date	~80%
Average first-time delivery	~5 days after due date
Full term range	37-42 weeks

Preparation Countdown — Working Backward from Due Date

Weeks Before Due Date	Task	Priority
20 weeks (month 5)	Start nursery planning, research gear	Low — time to browse
16 weeks (month 6)	Baby shower, start buying essentials	Medium
12 weeks (month 7)	Set up nursery, wash baby clothes	Medium
8 weeks	Write birth plan, preregister at hospital	High
5 weeks	Pack hospital bag, install car seat	High
4 weeks	Nursery fully ready, freezer meals prepared	High
2 weeks	Bags by the door, phone charged, route to hospital practiced	Critical
Due date	Relax — baby comes when baby is ready	Wait

Related Tools for Parents

• Countdown Timer — live countdown to due date
• Date Calculator — add 280 days to LMP for due date
• Age Calculator — track baby exact age after birth
• BMI Calculator — pre-pregnancy BMI for health tracking
• Calorie Calculator — nutrition needs during pregnancy
• Percentage Calculator — how far through pregnancy you are