Pregnancy Week by Week — Weeks 4 to 42

Every week of pregnancy on its own page: days gestation, the size and weight comparison, which trimester it belongs to, and the appointments still ahead. The numbers come from the same calculator, so the week you land on here is the week the tool reports.

Months

1 months (weeks 1–4) 2 months (weeks 5–8) 3 months (weeks 9–13) 4 months (weeks 14–17) 5 months (weeks 18–21) 6 months (weeks 22–26) 7 months (weeks 27–30) 8 months (weeks 31–35) 9 months (weeks 36–40)

Weeks 4 to 42

Week	Size	Weight	Trimester	Days to go
4	a poppy seed	under 0.01 g	1st	252
5	an apple seed	under 0.01 g	1st	245
6	a sweet pea	about 0.05 g	1st	238
7	a blueberry	about 0.1 g	1st	231
8	a raspberry	about 0.15 g	1st	224
9	a cherry	about 0.35 g	1st	217
10	a strawberry	about 0.9 g	1st	210
11	a fig	about 1.2 g	1st	203
12	a lime	about 1.5 g	1st	196
13	a lemon	about 1.8 g	2nd	189
14	a peach	about 2.4 g	2nd	182
15	an apple	about 2.9 g	2nd	175
16	an avocado	about 3.5 g	2nd	168
17	a turnip	about 4.5 g	2nd	161
18	a bell pepper	about 5.7 g	2nd	154
19	a mango	about 7 g	2nd	147
20	a banana	about 8.4 g	2nd	140
21	a carrot	about 10 g	2nd	133
22	a papaya	about 11.5 g	2nd	126
23	a grapefruit	about 12.9 g	2nd	119
24	an ear of corn	about 14.3 g	2nd	112
25	a rutabaga	about 15.7 g	2nd	105
26	a head of lettuce	about 17.1 g	2nd	98
27	a cauliflower	about 18.5 g	2nd	91
28	an eggplant	about 20 g	3rd	84
29	a butternut squash	about 21.5 g	3rd	77
30	a cabbage	about 23 g	3rd	70
31	a coconut	about 24.5 g	3rd	63
32	a jicama	about 26 g	3rd	56
33	a pineapple	about 27.7 g	3rd	49
34	a cantaloupe	about 29.4 g	3rd	42
35	a honeydew melon	about 31.1 g	3rd	35
36	a papaya	about 32.8 g	3rd	28
37	a bunch of Swiss chard	about 34.6 g	3rd	21
38	a bunch of leeks	about 36.4 g	3rd	14
39	a pumpkin	about 38.2 g	3rd	7
40	a watermelon	about 39.8 g	3rd	0
41	a small watermelon	about 41.2 g	3rd	-7
42	a large watermelon	about 42.4 g	3rd	-14

Weeks 1–3 are not listed individually: gestational age is counted from the first day of your last period, so those weeks pass before conception. Dating becomes meaningful from week 4, when implantation is complete.