bumpcalc.comWeek 1
Baby is the size of a poppy seed
0.0 in (0.1 cm)
0.0 oz (0 g)
View week detailsPregnancy Week by Week: Your 42-Week Guide
Follow your full pregnancy timeline from week 1 through week 42 with structured, data-first weekly pages. Each week includes baby size, fetal length and weight estimates, recommended weight gain ranges by BMI category, and progress tracking. If you need to confirm your dating first, start with the due date calculator and then explore your current week.
First Trimester (Weeks 1-13)
Weeks 1 through 13 are focused on early development, initial organ formation, and major pregnancy dating milestones during prenatal care.
Week 2
Baby is the size of a sesame seed
0.1 in (0.2 cm)
0.0 oz (0 g)
View week detailsWeek 3
Baby is the size of a lentil
0.2 in (0.4 cm)
0.0 oz (0 g)
View week detailsWeek 4
Baby is the size of a blueberry
0.3 in (0.8 cm)
0.0 oz (0 g)
View week detailsWeek 5
Baby is the size of a raspberry
0.5 in (1.2 cm)
0.0 oz (0 g)
View week detailsWeek 6
Baby is the size of a sweet pea
0.7 in (1.8 cm)
0.0 oz (1 g)
View week detailsWeek 7
Baby is the size of a cherry
0.9 in (2.4 cm)
0.0 oz (1 g)
View week detailsWeek 8
Baby is the size of a grape
1.3 in (3.2 cm)
0.0 oz (1 g)
View week detailsWeek 9
Baby is the size of a kumquat
1.6 in (4.1 cm)
0.1 oz (2 g)
View week detailsWeek 10
Baby is the size of a strawberry
2.1 in (5.3 cm)
0.1 oz (4 g)
View week detailsWeek 11
Baby is the size of a fig
2.5 in (6.4 cm)
0.2 oz (7 g)
View week detailsWeek 12
Baby is the size of a lime
2.9 in (7.4 cm)
0.5 oz (14 g)
View week detailsWeek 13
Baby is the size of a lemon
3.4 in (8.7 cm)
0.8 oz (23 g)
View week detailsSecond Trimester (Weeks 14-27)
Weeks 14 through 27 often bring rapid fetal growth, clearer movement patterns, and anatomy-focused checkups as pregnancy progresses.
Week 14
Baby is the size of a apple
4.0 in (10.1 cm)
1.5 oz (43 g)
View week detailsWeek 15
Baby is the size of a navel orange
4.6 in (11.6 cm)
2.5 oz (70 g)
View week detailsWeek 16
Baby is the size of a avocado
5.1 in (13.0 cm)
3.5 oz (100 g)
View week detailsWeek 17
Baby is the size of a pear
5.6 in (14.2 cm)
4.9 oz (140 g)
View week detailsWeek 18
Baby is the size of a bell pepper
6.0 in (15.3 cm)
6.7 oz (190 g)
View week detailsWeek 19
Baby is the size of a mango
6.5 in (16.5 cm)
8.5 oz (240 g)
View week detailsWeek 20
Baby is the size of a banana
10.1 in (25.6 cm)
10.6 oz (300 g)
View week detailsWeek 21
Baby is the size of a carrot
10.5 in (26.7 cm)
12.7 oz (360 g)
View week detailsWeek 22
Baby is the size of a papaya
10.9 in (27.8 cm)
15.2 oz (430 g)
View week detailsWeek 23
Baby is the size of a grapefruit
11.4 in (28.9 cm)
17.7 oz (501 g)
View week detailsWeek 24
Baby is the size of a eggplant
11.8 in (30.0 cm)
21.2 oz (600 g)
View week detailsWeek 25
Baby is the size of a cauliflower
13.6 in (34.6 cm)
23.3 oz (660 g)
View week detailsWeek 26
Baby is the size of a lettuce
14.0 in (35.6 cm)
26.8 oz (760 g)
View week detailsWeek 27
Baby is the size of a broccoli crown
14.4 in (36.6 cm)
30.9 oz (875 g)
View week detailsThird Trimester (Weeks 28-42)
Weeks 28 through 42 center on steady growth, late-pregnancy monitoring, and preparing for labor, delivery, and postpartum recovery.
Week 28
Baby is the size of a coconut
14.8 in (37.6 cm)
35.5 oz (1005 g)
View week detailsWeek 29
Baby is the size of a butternut squash
15.2 in (38.6 cm)
40.7 oz (1153 g)
View week detailsWeek 30
Baby is the size of a cabbage
15.7 in (39.9 cm)
46.5 oz (1319 g)
View week detailsWeek 31
Baby is the size of a pineapple
16.2 in (41.1 cm)
53.0 oz (1502 g)
View week detailsWeek 32
Baby is the size of a jicama
16.7 in (42.4 cm)
60.0 oz (1702 g)
View week detailsWeek 33
Baby is the size of a durian
17.2 in (43.7 cm)
67.7 oz (1918 g)
View week detailsWeek 34
Baby is the size of a cantaloupe
17.7 in (45.0 cm)
75.7 oz (2146 g)
View week detailsWeek 35
Baby is the size of a honeydew
18.2 in (46.2 cm)
84.1 oz (2383 g)
View week detailsWeek 36
Baby is the size of a romaine heart
18.7 in (47.4 cm)
92.5 oz (2622 g)
View week detailsWeek 37
Baby is the size of a winter melon
19.1 in (48.6 cm)
100.8 oz (2859 g)
View week detailsWeek 38
Baby is the size of a pumpkin
19.6 in (49.8 cm)
108.7 oz (3083 g)
View week detailsWeek 39
Baby is the size of a mini watermelon
20.0 in (50.7 cm)
116.0 oz (3288 g)
View week detailsWeek 40
Baby is the size of a watermelon
20.2 in (51.2 cm)
122.1 oz (3462 g)
View week detailsWeek 41
Baby is the size of a jackfruit
20.3 in (51.5 cm)
126.9 oz (3597 g)
View week detailsWeek 42
Baby is the size of a large watermelon
20.4 in (51.7 cm)
130.0 oz (3685 g)
View week details