Your baby now measures about 16.5 inches (42 cm) from head to foot and weighs about 4.8 pounds (2.18 kg) at the start of the week—and about 5.2 pounds (2.35 kg) at the end of the week.
Your baby’s immune system is now capable of fighting minor infections.
Day by day the amount of space lessens, and your baby’s movements are become larger and slower.
Fluid can accumulate in your body, which you’ll notice in swelling hands and feet, for example. Your rings may no longer fit.
You have about 0.3 to 0.4 additional gallons of blood in your body but from now on, your blood volume will remain constant until you give birth.
You should feel movement in your belly every day from the time you first felt your baby’s movements. Your baby makes both big and little movements inside your belly. You may not necessarily feel when baby sucks her thumb or makes tiny gripping motions with her hands, but most babies kick, and you’ll definitely feel other big movements, particularly during the latter part of your pregnancy.
That said, your baby will sleep several times a day so there will be moments of calm. Most babies are active in the evening and early in the morning, and the amount of kicking—and the force behind the kicks—can vary from baby to baby.
If you’re worried that your baby is moving less than usual, contact your health care provider immediately, day or night, particularly if you’re approaching your estimated due date.