My baby should weigh right about 4 and a half pounds and a little under 19 and a half inches long! Wow! My little baby is growing so fast!! I definatly am feeling her pressing on my bladder! It seems like I am in the bathroom every half hour. Its really annoying but its important to keep up with fluids right now! Baby’s amniotic fluid is changed every 3 hours so its important for moms to be to drink plenty of water, a singleton pregnancy has about a quart of amniotic fluid at all times!