Your baby's blood vessels are visible through his thin skin, and there's no baby fat yet to plump him up.
Avoid lying flat on your back now. Your growing uterus compresses major blood vessels, decreasing blood flow to your baby.
You're in your fourth month!
Your baby's skeleton is changing from soft cartilage to bone.
The umbilical cord – her lifeline to the placenta – is growing stronger and thicker.
Sweat glands are starting to develop.
Starting to feel a bit off balance? As your belly grows, your center of gravity changes, so you may begin to occasionally feel a little unsteady on your feet. Try to avoid situations with a high risk of falling. Wear low-heeled shoes to reduce your risk of taking a tumble; trauma to your abdomen could be dangerous for you and your baby.
You may also notice your eyes becoming drier. Using over-the-counter lubricating drops may help. If your contact lenses become uncomfortable, try wearing them for shorter stretches of time. If you still have discomfort, switch to glasses until after you give birth.
Don't see your symptom?
Wondering about a symptom you have? Find it on our pregnancy symptoms page.
Learn some relaxation techniques
Deep breathing, guided imagery, prenatal yoga, and progressive muscle relaxation can help you stay on an even keel – and sleep better.
Jot down your crazy pregnancy dreams
You may find that your dream life gets extra weird during pregnancy. (Thanks, pregnancy hormones!) It's worth writing some of your wildest ones down.
BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. We believe you should always know the source of the information you're seeing. Learn more about our editorial and medical review policies.
ACOG. 2015. FAQ156. Prenatal development: How your baby grows during pregnancy. American College of Obstetricians and Gynecologists. http://www.acog.org/Patients/FAQs/Prenatal-Development-How-Your-Baby-Grows-During-Pregnancy#one [Accessed May 2019]
Garfield P. 1991. Women’s Bodies, Women’s Dreams. New York, NY: Ballantine Books. [Accessed May 2019]
March of Dimes. 2014. Seat belts during pregnancy. http://www.marchofdimes.org/pregnancy/seatbelts-during-pregnancy.aspx [Accessed May 2019]
Mayo Clinic. 2015. Fetal development: The 2nd trimester. http://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/fetal-development/art-20046151 [Accessed May 2019]
MedlinePlus (ADAM). 2015. Fetal development. https://www.nlm.nih.gov/medlineplus/ency/article/002398.htm [Accessed May 2019]