 [ Symptoms ] what can i expect during week 16 of my pregnancy [ Disease ] baby  your baby now measures about 4 3 to 4 6 inches from crown to rump and weighs about 2 8 ounces fingernails are well formed and the fine hair lanugo may be growing on the head arms and legs are moving the nervous system is functioning and muscles are responding to stimulation from your baby is brain you may be able to hear the baby is heartbeat in the doctor is office mom to be  your uterus has grown significantly by now and weighs about 8 75 ounces within the next few weeks you may start to feel your baby move called quickening  it is often like a gas bubble or subtle fluttering movement as it happens more regularly you will know it is your baby there are other physiological changes happening in your body increased blood volume to support your growing fetus may produce nosebleeds and leg veins may become more apparent your uterus is shifting so you may not have to urinate so much tip of the week  if veins in your legs are beginning to bulge you may want to use support stockings elevate your feet when you can and exercise to improve blood flow