Twins or more
More Twins or more
Twins fetal development
Twins fetal development - 3 weeks pregnant
Twins fetal development - 4 to 7 weeks pregnant
Twins fetal development - 8 to 11 weeks pregnant
Twins fetal development - 12 to 15 weeks pregnant
Twins fetal development - 16 to 19 weeks pregnant
See all in Twins fetal developmentTrack your baby’s development
![](https://web.archive.org./web/20210411090554im_/https://assets.babycenter.com/ims/2012/01jan/FetalDev_Reg_Bottom.jpg)
Join now to receive free weekly newsletters tracking your baby’s development and yours throughout your pregnancy.
By registering you agree to our Terms of Use & Privacy policy. We use your information to send you emails, product samples, and promotions on this website and other properties. We use your health information to make our site even more helpful.