Week by week

How big is baby this week?

From poppy seed to pumpkin — 36 weeks of growth. Set your due date on the home page to highlight your current week.

Week 4

Poppy seed

1 mm · <1 g

Implantation. The blastocyst becomes an embryo.

Week 5

Sesame seed

2 mm · <1 g

Heart begins to form and beat faintly.

Week 6

Lentil

5 mm · <1 g

Facial features and limb buds appear.

Week 7

Blueberry

1 cm · <1 g

Brain grows fast; arms and legs lengthen.

Week 8

Raspberry

1.6 cm · 1 g

Now officially a fetus. Fingers webbed.

Week 9

Cherry

2.3 cm · 2 g

Tiny muscles allow first movements.

Week 10

Strawberry

3.1 cm · 4 g

Vital organs are all present.

Week 11

Fig

4.1 cm · 7 g

Fingernails begin to form.

Week 12

Lime

5.4 cm · 14 g

Reflexes kick in; can open and close fists.

Week 13

Peapod

7.4 cm · 23 g

Vocal cords develop.

Week 14

Lemon

8.7 cm · 43 g

Facial expressions begin — squinting, frowning.

Week 15

Apple

10 cm · 70 g

Can sense light through eyelids.

Week 16

Avocado

12 cm · 100 g

Tiny bones in the ears — may hear your voice.

Week 17

Pomegranate

13 cm · 140 g

Fat starts to form under the skin.

Week 18

Bell pepper

14 cm · 190 g

You may feel first flutters (quickening).

Week 19

Heirloom tomato

15 cm · 240 g

Vernix (protective coating) forms.

Week 20

Banana

25 cm · 300 g

Halfway there. Anatomy scan around now.

Week 21

Carrot

27 cm · 360 g

Movements become more coordinated.

Week 22

Spaghetti squash

28 cm · 430 g

Eyebrows and lips are well defined.

Week 23

Large mango

29 cm · 500 g

Skin is red and wrinkled — muscle forming.

Week 24

Ear of corn

30 cm · 600 g

Viability milestone with NICU support.

Week 25

Rutabaga

34 cm · 660 g

Hair color and texture developing.

Week 26

Scallion bunch

35 cm · 760 g

Eyes open; startle reflex present.

Week 27

Head of cauliflower

36 cm · 875 g

Brain activity resembles a newborn's.

Week 28

Eggplant

37 cm · 1 kg

Third trimester begins. REM sleep observed.

Week 29

Butternut squash

38 cm · 1.15 kg

Bones fully developed but still soft.

Week 30

Large cabbage

40 cm · 1.3 kg

Amniotic fluid begins to decrease.

Week 31

Coconut

41 cm · 1.5 kg

All 5 senses functioning.

Week 32

Jicama

42 cm · 1.7 kg

Practices breathing motions.

Week 33

Pineapple

43 cm · 1.9 kg

Skull still soft to ease birth.

Week 34

Cantaloupe

45 cm · 2.15 kg

Central nervous system maturing.

Week 35

Honeydew melon

46 cm · 2.4 kg

Kidneys fully developed.

Week 36

Head of romaine

47 cm · 2.6 kg

Considered early term next week.

Week 37

Bunch of Swiss chard

48 cm · 2.85 kg

Early term. Practicing sucking & grasping.

Week 38

Leek

49 cm · 3.1 kg

Vernix and lanugo mostly shed.

Week 39

Mini watermelon

50 cm · 3.3 kg

Full term. Brain grows rapidly still.

Week 40

Small pumpkin

51 cm · 3.5 kg

Due date week. Any day now.

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