How big is the baby in the womb at 13 weeks?

At 13 weeks your baby is 3 inches and weighs about 20 grams. This is the week that your baby will now start to make a fist and suck his/her thumb. Your baby's vocal chords are now fully developed and his tooth sockets are developed! Check out http://3dpregnancy.parentsconnect.com/calendar/13-weeks-pregnant.html for more information and a 3d picture!