By now, your baby weighs 3.75 pounds (pick up a large jicama) and is about 16.7 inches long, taking up a lot of space in your uterus. You’re gaining about a pound a week and roughly half of that goes right to your baby. In fact, she’ll gain a third to half of her birth weight during the next 7 weeks as she fattens up for survival outside the womb. She now has toenails, fingernails, and real hair (or at least respectable peach fuzz). Her skin is becoming soft and smooth as she plumps up in preparation for birth.
To accommodate you and your baby’s growing needs, your blood volume has increased 40 to 50 percent since you got pregnant. With your uterus pushing up near your diaphragm and crowding your stomach, the consequences may be shortness of breath and heartburn.
You may have lower-back pain as your pregnancy advances.Assuming it’s not preterm labor that’s ailing you, you can probably blame your growing uterus and hormonal changes for your aching back. Your expanding uterus shifts your center of gravity and stretches out and weakens your abdominal muscles, changing your posture and putting a strain on your back. Hormonal changes in pregnancy loosen your joints and the ligaments that attach your pelvic bones to your spine. This can make you feel less stable and cause pain when you walk, stand, sit for long periods, roll over in bed, get out of a low chair or the tub, bend, or lift things.
ally-cat 
Why do they always reference the strangest things when referring to the baby’s size? A jicama? Really? The blood volume is kinda freaky..only because where does it go after Lucas is born? And are you having shortness of breath? That would freak me out major and i’d probably have a panic attack if i felt like i couldn’t get enough air.
i dunno – half these veggies and fruits ive never heard of. i guess when lucas is born, a tidal wave of blood will come gushing out along with the baby to empty me out. i have shortness of breath when i try to walk fast or climb stairs…like the way you get after working out.