--- title: "17 weeks pregnant: baby the size of a pear | PERIOD." description: "17 weeks pregnant: your baby is the size of a pear, about 13 cm and 179 g. What happens this week for your baby and in your body." url: https://myperiod.app/en/pregnancy/17-weeks-pregnant lang: en publisher: PERIOD. B.V., Amsterdam --- [Pregnancy week by week](https://myperiod.app/en/pregnancy) # 17 weeks pregnant At 17 weeks you are in month 4 and the second trimester. Your baby is about the size of a pear: 13 cm and 179 g. As big as pear Length 13 cm Weight 179 g Month 4 Trimester second trimester To go 161 days Averages. Measured crown to rump up to week 20, crown to heel after that. Healthy babies vary a lot. ## Your baby this week A first layer of fat is forming: insulation for later. ## Your body Your balance shifts a little along with your growing bump. ## Good to know The baby already has sleep and wake rhythms, which rarely match yours. ## To sort around these weeks - The 20 week scan is usually planned between week 18 and 21. - Many women feel the first movements in these weeks. [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 17 weeks pregnant? 17 weeks pregnant falls in month 4 of your pregnancy. ### Which trimester is 17 weeks? At 17 weeks you are in the second trimester. ### How big is a baby at 17 weeks? On average 13 cm, about the size of a pear. Healthy babies vary a lot. ### How long to go at 17 weeks? Until your due date (40 weeks): 23 weeks, 161 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.