How do I read a pregnancy week by week chart?

Find your current week in the first column. Weeks are counted from the first day of your last period, so week 1 is your period and conception happens around week 2. The row shows the month and trimester, your baby's typical size, a milestone and the care that usually happens around then.

How many weeks are in each month of pregnancy?

Roughly 4 to 5. Forty weeks is a little over 9 calendar months, so charts round differently. A common split is months 1 to 3 = weeks 1 to 13, months 4 to 6 = weeks 14 to 27, and months 7 to 9 = weeks 28 to 40.

Are the baby sizes in the chart exact?

No. They're typical averages from fetal growth references, shown as fruit or vegetables to make them easy to picture. Healthy babies vary, and your scan measurements may be different. Your midwife or doctor will tell you if growth needs checking.

Can I print this pregnancy chart?

Yes. Use your browser's print option on this page; the chart prints on two pages in portrait. You can also save it as a PDF. Keep it with your maternity notes or on the fridge and tick off weeks as you go.

Is the chart the same in the US and UK?

The weeks, sizes and milestones are the same. The trimester line differs slightly: ACOG ends the first trimester at 13 weeks 6 days, while NHS pages often say week 12. Appointment timing also varies by country and provider.

Pregnancy Week by Week Chart, Weeks 1

Medically reviewed by: Safi Allah Khan · Written by the Momi team · Last updated 20 October 2026

Quick answer: This pregnancy week by week chart lists all 40 weeks with the month, trimester, your baby's typical size, a key milestone and the appointments or to-dos that usually fall in that week. Weeks are counted from the first day of your last period. Sizes are averages; your baby and your care plan may differ.

Use it as a one-page overview. For full detail on any week, open that week in our pregnancy week by week guide. Not sure which week you're in? Use How Many Weeks Pregnant Am I?.

How to read the chart

Week is your gestational age: completed weeks since the first day of your last period (LMP). At 12+3 you're on the "12" row.
Month uses a common split of 40 weeks into 9 months. Some sources split differently.
Trimester follows ACOG: the first runs to 13 weeks 6 days, the second to 27 weeks 6 days, the third to birth.
Size compares your baby with a familiar fruit or vegetable. Before about 20 weeks babies are measured crown to rump, after that head to heel.
Care and to-dos shows typical timings from NHS and ACOG guidance. Your own schedule may differ.

Pregnancy week by week chart

Week	Month	Trimester	Baby is about the size of	Milestone	Care and to-dos
1	1	1st	No baby yet	Pregnancy dating starts with your period	–
2	1	1st	No baby yet	Ovulation and possible conception	–
3	1	1st	No baby yet	Fertilisation and implantation	–
4	1	1st	a poppy seed	Positive test possible	Test from the day your period is due
5	2	1st	a sesame seed	Neural tube and heart begin forming	–
6	2	1st	a lentil	Heart activity may show on scan	Book your first appointment
7	2	1st	a blueberry	Arm and leg buds	–
8	2	1st	a raspberry	End of embryo's first stage	First prenatal visit (8–12 wks)
9	3	1st	a grape	Fingers and toes separating	–
10	3	1st	a kumquat	All major organs forming	Screening window opens
11	3	1st	a fig	Now called a fetus	–
12	3	1st	a lime	Dating scan window	Dating scan; combined screening
13	3	1st	a lemon	Last week of trimester one	–
14	4	2nd	a nectarine	Second trimester begins	–
15	4	2nd	an apple	Bones hardening	–
16	4	2nd	an avocado	First movements possible	Routine check
17	4	2nd	a pear	Fat stores start	–
18	5	2nd	a bell pepper	Hearing developing	Anatomy scan window opens
19	5	2nd	a mango	Vernix and lanugo forming	–
20	5	2nd	a banana	Anatomy scan window	20-week scan
21	5	2nd	a carrot	Movements more noticeable	–
22	5	2nd	a papaya	Senses sharpening	–
23	6	2nd	a grapefruit	Lots of REM sleep	–
24	6	2nd	an ear of corn	Lungs keep developing	Glucose test window (24–28 wks)
25	6	2nd	a rutabaga (swede)	Responds to familiar voices	–
26	6	2nd	a head of lettuce	Eyes begin to open	–
27	6	2nd	a cauliflower	Last week of trimester two	–
28	7	3rd	an eggplant (aubergine)	Third trimester begins	Sleep on your side; learn movements
29	7	3rd	a butternut squash	Rapid weight gain	–
30	7	3rd	a cabbage	Bone marrow makes blood cells	–
31	7	3rd	a coconut	Major development largely done	–
32	8	3rd	a squash	Practising breathing	Check-up; birth planning
33	8	3rd	a pineapple	Skull stays soft	–
34	8	3rd	a cantaloupe melon	Lungs maturing	Start packing your bag
35	8	3rd	a honeydew melon	Space getting tight	–
36	9	3rd	a romaine lettuce	Baby may drop lower	Ask when to call in labor
37	9	3rd	a bunch of Swiss chard	Early term	Bag packed
38	9	3rd	a leek	Gaining fat	–
39	9	3rd	a small watermelon	Full term	–
40	9	3rd	a small pumpkin	Due date week	Due date

The chart by trimester

First trimester (weeks 1–13)

Weeks 1 and 2 happen before conception, which is why your due date is 40 weeks from your period. By week 8, ACOG notes the embryo is about half an inch long. By week 12 the fetus is about 2 inches long. Common symptoms include tiredness, nausea, sore breasts and needing to pee more often. See first trimester symptoms.

Key care: first appointment, usually 8 to 12 weeks, and a dating scan at around 10 to 14 weeks. Screening is often offered at the same time; see first trimester screening.

Second trimester (weeks 14–27)

Many people find energy returns and nausea fades. Your baby's hearing develops, and the NHS says most people feel movements between 16 and 24 weeks. The anatomy scan is usually between 18 and 21 weeks, and a glucose test may be offered between 24 and 28 weeks.

Third trimester (weeks 28–40)

Your baby gains weight quickly and usually settles head-down. The NHS advises going to sleep on your side from 28 weeks. Appointments become more frequent. Get to know your baby's usual pattern of movements and call your maternity unit straight away if it changes. See the third trimester guide.

Printable version

To print this pregnancy chart:

Open your browser's menu and choose Print, or press Ctrl+P (Cmd+P on Mac).
Pick Portrait and "Fit to page width" if offered.
Choose Save as PDF if you'd rather keep a digital copy.

The chart prints over two pages. Many people keep it with their maternity notes and tick off each week. If you'd like a version with your own dates, write your due date at the top and count back: week 40 is your due date, week 39 is the 7 days before, and so on.

Fill in your own dates

Your key date	How to work it out	Write it here
Due date	First day of last period + 280 days	________
Start of week 13	Due date − 28 weeks	________
Start of week 28	Due date − 12 weeks	________
Start of week 37	Due date − 3 weeks	________

The due date calculator does these sums for you.

What the chart can't tell you

A chart is a map, not a diagnosis. It can't tell you whether a symptom is normal for you. Call your midwife, doctor or maternity unit if you have:

vaginal bleeding or leaking fluid
severe or constant belly pain
a severe headache, vision changes or sudden swelling
your baby moving less than usual, or a change in their pattern
fever, or vomiting so severe you can't keep fluids down

In an emergency, call your local emergency number.

Track your week on the chart with Momi

Momi turns this chart into a daily view. Set your due date from your last period or conception date, and the app shows your current week, your baby's size and development, and tips for that stage. You can log your symptoms in the diary, add appointments with medicine reminders, and track your weight as you go.

Download Momi free on the App Store or Google Play. Free with ads; optional Premium.

Sources

ACOG, Changes During Pregnancy (infographic)
NHS, Your antenatal appointments
NHS, Screening tests in pregnancy
NHS, Your baby's movements
NHS, Tiredness and sleep problems

Medical disclaimer: Momi and this website provide general information, not medical advice. Always talk to your doctor or midwife; in an emergency call your local emergency number.

Pregnancy Week by Week Chart (Weeks 1–40)