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At about 20 weeks pregnant you’re halfway there, and it's natural to wonder, "How big is my baby?" Turns out your baby may weigh about 7.5 to 10.5 ounces and measure anywhere from 6.3 to 8.5 inches — just big enough that you could cup the little guy in the palm of your hand. Besides rolling and kicking, your baby might now be hiccupping too! It’s also during this week that you might go for your mid-pregnancy ultrasound. Pregnancy symptoms this week include constipation, a burst of energy, and hunger pangs. At this stage of pregnancy, gaining about 1 to 2 pounds per week is normal. For even more information about what you might experience during the mid-point of pregnancy, keep reading for our summary of this week’s most exciting milestones.

20 Weeks Pregnant: Your Baby’s Development

There’s a lot of growing going on in there. Find out what sort of developments your baby may be working on this week:

  • Sensing the world. Your baby is starting to experience the world around him, limited though it may be. His brain has been working overtime to develop the nerve centers dedicated to his senses. As these senses come alive, he's more responsive to your activity, sounds in the environment, and even the taste of the amniotic fluid.
  • Moving moments. It's likely that around this week, you’ll be able to feel your baby's movements – this is sometimes called quickening. During the next few weeks, you might feel quite a bit of rolling, kicking, and diving as your baby has plenty of room to maneuver.
  • Getting the hiccups. Besides those little pokes and jabs, you might detect some rhythmic jerking — baby hiccups! Most babies get the hiccups in utero, and these are possibly due to an immature diaphragm having spasms. No need to worry, though — they're not causing him any harm.
  • Sprouting a top. This new hair isn't lanugo (the layer of fine, soft hair that covers a fetus); it's the real deal. Most of it, though, will fall out about two weeks after birth. Elsewhere on your baby's head, the bones of the inner ear are fully formed, and the nose is beginning to take shape.
  • Second skin. Around this week, your baby is completely covered in vernix, a creamy substance protecting their delicate skin from the amniotic fluid.
  • Thumb sucking. Your baby might be sucking his thumb by this week, as his sucking reflex develops.
  • Uterus reaches your navel. This week, your uterus has grown to three times its original height, and the top is now probably even with your belly button. From now on, your uterus will grow approximately 1 centimeter per week until your baby arrives.
pregnancy week 20 fetus

If You Were to Have an Ultrasound at 20 Weeks

This week, or at some point in mid-pregnancy (usually between 18 to 22 weeks), you may have an ultrasound at which your doctor will check your baby's growth and development, confirm your due date, screen for certain birth defects, and assess the health of the placenta and umbilical cord. Your doctor will also count your baby’s fingers and toes.

This might also be your first peek at your baby, making parenthood seem all the more real. Ask for a printout of the ultrasound image, so you can start your baby's first photo album.

Read more about the ultrasounds you may have during pregnancy.

20 Weeks Pregnant: Your Symptoms

Some of the pregnancy symptoms you can expect around this week might include:

  • Constipation. Hormonal activity and the growing baby pushing against your intestines can lead to constipation. Although this condition can be uncomfortable, drinking more water and eating more fiber can help get things moving.
  • Extra energy. You’re in the thick of the second trimester, often considered the "honeymoon’" phase of pregnancy. This means you might have extra energy to do some pregnancy exercise or get your home organized before the baby’s arrival.
  • Hunger. As your baby grows and the queasiness you may have felt in the first trimester subsides, you might be feeling extra hungry.

By the way, you might be wondering how many months of pregnancy 20 weeks is. You’re "about" four months pregnant but since each month is a little longer than four weeks, this is only an approximation.

If you’re 20 weeks pregnant with twins, you might notice your belly growing quicker than it would with a single baby. Find out more about what happens each week while pregnant with twins.

FAQ at 20 Weeks

How can I help my partner adjust to my pregnancy?

Expectant dads can sometimes find it difficult to adjust, because the major pregnancy milestones are experienced by moms-to-be. Bring dad along with you to the ultrasound, and get him involved in brainstorming baby names. For more information on helping your partner cope, read up on how dads can prepare for parenthood.

What pregnancy exercises can I do?

Speak to your healthcare provider about safe pregnancy exercises you can do. Consider something like prenatal yoga, and read our tips on exercising while pregnant for even more inspiration.

How much weight should I gain by 20 weeks pregnant?

Your doctor or nurse will be able to give you advice based on your personal situation, and considering your weight at the start of pregnancy. Many experts recommend an average weight gain of 1 to 4.5 pounds in the first trimester, and then 1 to 2 pounds per week during the second trimester.

20 Weeks Pregnant: Your Checklist

Celebrate — you’re halfway there!

At your ultrasound scan, learn whether you're expecting a girl or a boy (or choose to wait and be surprised).

Relax. Too much stress can have negative effects on you and maybe even your baby. Try some gentle pregnancy exercise, or speak to your doctor for expert advice.

If you happen to have a prenatal care appointment this week, you can ask your doctor or nurse whether you should sleep in a certain position to help you feel more comfortable.

Sign up for even more weekly pregnancy tips.

20 Weeks Pregnant: Your Checklist

Celebrate — you’re halfway there!

At your ultrasound scan, learn whether you're expecting a girl or a boy (or choose to wait and be surprised).

Relax. Too much stress can have negative effects on you and maybe even your baby. Try some gentle pregnancy exercise, or speak to your doctor for expert advice.

Sign up to get weekly pregnancy tips