Baby's the size of an onion!

Baby's skeleton is hardening, changing from rubbery cartilage to bone, and fat is finally accumulating around it. The umbilical cord is getting thicker and stronger, and those little fingers and toes are now topped by one-of-a-kind prints.

Taken from: http://pregnant.thebump.com/pregnancy/pregnancy-tools/slideshow/how-big-is-baby.aspx?page=14

Also, Baby can move its joints, and its sweat glands are starting to develop.

Taken from: http://www.babycenter.com/6_your-pregnancy-17-weeks_1106.bc