---
title: "Pregnancy week by week: weeks 4 to 42 | PERIOD."
description: "How big is your baby and what is happening in your body? Every week of pregnancy from week 4 to 42, with length and weight."
url: https://myperiod.app/en/pregnancy
lang: en
publisher: PERIOD. B.V., Amsterdam
---

PERIOD. baby

# Pregnancy week by week

Pick your week. For each week you see how big your baby is, what is happening and what your body is doing.

- [4](https://myperiod.app/en/pregnancy/4-weeks-pregnant)
- [5](https://myperiod.app/en/pregnancy/5-weeks-pregnant)
- [6](https://myperiod.app/en/pregnancy/6-weeks-pregnant)
- [7](https://myperiod.app/en/pregnancy/7-weeks-pregnant)
- [8](https://myperiod.app/en/pregnancy/8-weeks-pregnant)
- [9](https://myperiod.app/en/pregnancy/9-weeks-pregnant)
- [10](https://myperiod.app/en/pregnancy/10-weeks-pregnant)
- [11](https://myperiod.app/en/pregnancy/11-weeks-pregnant)
- [12](https://myperiod.app/en/pregnancy/12-weeks-pregnant)
- [13](https://myperiod.app/en/pregnancy/13-weeks-pregnant)
- [14](https://myperiod.app/en/pregnancy/14-weeks-pregnant)
- [15](https://myperiod.app/en/pregnancy/15-weeks-pregnant)
- [16](https://myperiod.app/en/pregnancy/16-weeks-pregnant)
- [17](https://myperiod.app/en/pregnancy/17-weeks-pregnant)
- [18](https://myperiod.app/en/pregnancy/18-weeks-pregnant)
- [19](https://myperiod.app/en/pregnancy/19-weeks-pregnant)
- [20](https://myperiod.app/en/pregnancy/20-weeks-pregnant)
- [21](https://myperiod.app/en/pregnancy/21-weeks-pregnant)
- [22](https://myperiod.app/en/pregnancy/22-weeks-pregnant)
- [23](https://myperiod.app/en/pregnancy/23-weeks-pregnant)
- [24](https://myperiod.app/en/pregnancy/24-weeks-pregnant)
- [25](https://myperiod.app/en/pregnancy/25-weeks-pregnant)
- [26](https://myperiod.app/en/pregnancy/26-weeks-pregnant)
- [27](https://myperiod.app/en/pregnancy/27-weeks-pregnant)
- [28](https://myperiod.app/en/pregnancy/28-weeks-pregnant)
- [29](https://myperiod.app/en/pregnancy/29-weeks-pregnant)
- [30](https://myperiod.app/en/pregnancy/30-weeks-pregnant)
- [31](https://myperiod.app/en/pregnancy/31-weeks-pregnant)
- [32](https://myperiod.app/en/pregnancy/32-weeks-pregnant)
- [33](https://myperiod.app/en/pregnancy/33-weeks-pregnant)
- [34](https://myperiod.app/en/pregnancy/34-weeks-pregnant)
- [35](https://myperiod.app/en/pregnancy/35-weeks-pregnant)
- [36](https://myperiod.app/en/pregnancy/36-weeks-pregnant)
- [37](https://myperiod.app/en/pregnancy/37-weeks-pregnant)
- [38](https://myperiod.app/en/pregnancy/38-weeks-pregnant)
- [39](https://myperiod.app/en/pregnancy/39-weeks-pregnant)
- [40](https://myperiod.app/en/pregnancy/40-weeks-pregnant)
- [41](https://myperiod.app/en/pregnancy/41-weeks-pregnant)
- [42](https://myperiod.app/en/pregnancy/42-weeks-pregnant)

[Work out your due date](https://myperiod.app/en/tools/due-date-calculator)[How many weeks pregnant am I?](https://myperiod.app/en/tools/pregnancy-week-calculator)

## first trimester

- [4 weeks pregnant](https://myperiod.app/en/pregnancy/4-weeks-pregnant) · poppy seed
- [5 weeks pregnant](https://myperiod.app/en/pregnancy/5-weeks-pregnant) · sesame seed
- [6 weeks pregnant](https://myperiod.app/en/pregnancy/6-weeks-pregnant) · lentil
- [7 weeks pregnant](https://myperiod.app/en/pregnancy/7-weeks-pregnant) · blueberry
- [8 weeks pregnant](https://myperiod.app/en/pregnancy/8-weeks-pregnant) · strawberry
- [9 weeks pregnant](https://myperiod.app/en/pregnancy/9-weeks-pregnant) · grape
- [10 weeks pregnant](https://myperiod.app/en/pregnancy/10-weeks-pregnant) · apricot
- [11 weeks pregnant](https://myperiod.app/en/pregnancy/11-weeks-pregnant) · kiwi
- [12 weeks pregnant](https://myperiod.app/en/pregnancy/12-weeks-pregnant) · lime
- [13 weeks pregnant](https://myperiod.app/en/pregnancy/13-weeks-pregnant) · pea pod

## second trimester

- [14 weeks pregnant](https://myperiod.app/en/pregnancy/14-weeks-pregnant) · mandarin
- [15 weeks pregnant](https://myperiod.app/en/pregnancy/15-weeks-pregnant) · apple
- [16 weeks pregnant](https://myperiod.app/en/pregnancy/16-weeks-pregnant) · avocado
- [17 weeks pregnant](https://myperiod.app/en/pregnancy/17-weeks-pregnant) · pear
- [18 weeks pregnant](https://myperiod.app/en/pregnancy/18-weeks-pregnant) · bell pepper
- [19 weeks pregnant](https://myperiod.app/en/pregnancy/19-weeks-pregnant) · tomato
- [20 weeks pregnant](https://myperiod.app/en/pregnancy/20-weeks-pregnant) · banana
- [21 weeks pregnant](https://myperiod.app/en/pregnancy/21-weeks-pregnant) · carrot
- [22 weeks pregnant](https://myperiod.app/en/pregnancy/22-weeks-pregnant) · corn cob
- [23 weeks pregnant](https://myperiod.app/en/pregnancy/23-weeks-pregnant) · mango
- [24 weeks pregnant](https://myperiod.app/en/pregnancy/24-weeks-pregnant) · broccoli
- [25 weeks pregnant](https://myperiod.app/en/pregnancy/25-weeks-pregnant) · potato
- [26 weeks pregnant](https://myperiod.app/en/pregnancy/26-weeks-pregnant) · courgette
- [27 weeks pregnant](https://myperiod.app/en/pregnancy/27-weeks-pregnant) · cabbage

## third trimester

- [28 weeks pregnant](https://myperiod.app/en/pregnancy/28-weeks-pregnant) · aubergine
- [29 weeks pregnant](https://myperiod.app/en/pregnancy/29-weeks-pregnant) · sweet potato
- [30 weeks pregnant](https://myperiod.app/en/pregnancy/30-weeks-pregnant) · coconut
- [31 weeks pregnant](https://myperiod.app/en/pregnancy/31-weeks-pregnant) · pineapple
- [32 weeks pregnant](https://myperiod.app/en/pregnancy/32-weeks-pregnant) · napa cabbage
- [33 weeks pregnant](https://myperiod.app/en/pregnancy/33-weeks-pregnant) · melon
- [34 weeks pregnant](https://myperiod.app/en/pregnancy/34-weeks-pregnant) · pumpkin
- [35 weeks pregnant](https://myperiod.app/en/pregnancy/35-weeks-pregnant) · teddy bear
- [36 weeks pregnant](https://myperiod.app/en/pregnancy/36-weeks-pregnant) · lettuce
- [37 weeks pregnant](https://myperiod.app/en/pregnancy/37-weeks-pregnant) · baguette
- [38 weeks pregnant](https://myperiod.app/en/pregnancy/38-weeks-pregnant) · small watermelon
- [39 weeks pregnant](https://myperiod.app/en/pregnancy/39-weeks-pregnant) · watermelon
- [40 weeks pregnant](https://myperiod.app/en/pregnancy/40-weeks-pregnant) · watermelon
- [41 weeks pregnant](https://myperiod.app/en/pregnancy/41-weeks-pregnant) · large watermelon
- [42 weeks pregnant](https://myperiod.app/en/pregnancy/42-weeks-pregnant) · big watermelon

## Follow your pregnancy week by week

In PERIOD. baby you see every week how big your baby is, what is happening and what you can arrange. No ads, and we never sell your data.

4.8 ★★★★★ on the App Store

100,000+ women

General information, not medical advice. If in doubt, call your midwife or GP. Sources: WHO fetal growth charts (Kiserud et al., PLoS Med 2017); Robinson and Fleming 1975; NHS, Your pregnancy and baby guide.