--- title: "21 weeks pregnant: baby the size of a carrot | PERIOD." description: "21 weeks pregnant: your baby is the size of a carrot, about 27.1 cm and 398 g. What happens this week for your baby and in your body." url: https://myperiod.app/en/pregnancy/21-weeks-pregnant lang: en publisher: PERIOD. B.V., Amsterdam --- [Pregnancy week by week](https://myperiod.app/en/pregnancy) # 21 weeks pregnant At 21 weeks you are in month 5 and the second trimester. Your baby is about the size of a carrot: 27.1 cm and 398 g. As big as carrot Length 27.1 cm Weight 398 g Month 5 Trimester second trimester To go 133 days Averages. Measured crown to rump up to week 20, crown to heel after that. Healthy babies vary a lot. ## Your baby this week Swallowing and 'breathing' amniotic fluid: everything gets practised. ## Your body Your bump is visibly growing; clothes start to fit differently. ## Good to know Taste buds are developed; what you eat flavours the amniotic fluid. ## To sort around these weeks - Find out how maternity leave and pay work for you and your employer. - Start thinking about antenatal classes and who will support you after the birth. [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) ## 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 ## Frequently asked questions ### How many months is 21 weeks pregnant? 21 weeks pregnant falls in month 5 of your pregnancy. ### Which trimester is 21 weeks? At 21 weeks you are in the second trimester. ### How big is a baby at 21 weeks? On average 27.1 cm, about the size of a carrot. Healthy babies vary a lot. ### How long to go at 21 weeks? Until your due date (40 weeks): 19 weeks, 133 days. ## [All weeks](https://myperiod.app/en/pregnancy) - [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) 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.