Month 4
of pregnancy
Fetal development

Height
~5 in
Weight
>3 oz
Monthly highlights
- 1Baby’s Development. By the end of month 4, your baby is about 5 inches long and weighs around 5 ounces. Facial features are becoming more defined, arms and legs are moving, and baby may even make tiny fists. Kidneys are producing urine, and your baby is beginning to hear—so talking, reading, or singing can help with early bonding.
- 2Bodily Changes & Symptoms. Many parents feel more energy and notice nausea easing this month. You may start to show as your bump appears. Common symptoms include food cravings, round ligament pain, sensitive gums, spider veins, nasal congestion, and vivid dreams. Stretch marks and itchiness may also develop as your skin stretches.
- 3Health & Wellness. Maintain gentle exercise, hydrate well, and keep up with dental care. Use a soft toothbrush and saltwater rinses if gums feel sensitive. Moisturizers and a humidifier can ease skin or sinus discomfort. Seek care promptly if you notice painful urination, back pain, or fever, as these may signal a UTI.
- 4Tips & To-Dos. This is a great time to announce your pregnancy more widely, start a baby registry, and shop for maternity clothing. Ask your provider about genetic screenings or amniocentesis, and begin researching birth locations and insurance coverage. Many families also start shortlisting baby names or planning a babymoon this month.
Checklist for month 4
- If you’re ready to share your special news, check out these fun and exciting ideas for how to announce your pregnancy to friends and family.
- After you have told your boss that you’re pregnant, you might like to start sharing the news with coworkers. We’ve got you covered with some great ideas on how to tell your colleagues you’re pregnant.
- Ask your healthcare provider whether any genetic screening tests are recommended for you this month. Tests that may be mentioned include amniocentisis and the Maternal Serum Alpha-Fetoprotein (MSAFP) test.
- Although it might seem like early days, starting your baby shower registry sooner rather than later can help ensure you don’t have to rush it at the last minute. Keep in mind, your baby shower’s organizer will need your finalized registry when creating the invitations so ask the host when they plan to send those out so you have your deadline. To get you started, here are some baby registry must-haves.
- Check out our Baby Name Generator, which lets you play with different settings to help you land on a name you love.
- Look into possible places where you could give birth. These can include local hospitals or birthing centers. Your healthcare provider and your insurance company can let you know what’s available and what's covered in your area.
- Start browsing maternity wear. Although your baby bump at four months pregnant may not need full-on maternity clothing, you might want to start looking for some more comfortable clothing options so that you’re prepared when the time comes.
- Plan a getaway if you're feeling up to it. Need some inspiration? Take our What Is Your Ideal Babymoon Destination? quiz to get some ideas!

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Key Takeaways
Four months pregnant is kind of a big deal. Lots of exciting milestones occur this month — not least of which is that you are now entering the second trimester. Read on to find out more about symptoms you may experience at four months pregnant, how your baby is developing this month, and get our helpful checklist on the kinds of things to take care of in the coming weeks.
Common Pregnancy Symptoms at 4 Months Pregnant
Although you might not experience all of them, these are some of the more common pregnancy symptoms at four months pregnant:
How Is Your Baby Developing This Month?
Though still quite small, your baby is already developing facial features and is also working on certain movements, like flexing the arms and legs and clasping hands into fists. When you’re four months pregnant, there’s still plenty of room for your baby to move around within the amniotic sac, so your little one is probably making the most of it.
At this point in your pregnancy, your little one is also starting to produce estrogen and testosterone, and genitals may be visible if you have an ultrasound exam this month or sometime soon.
In the meantime—before your mid-pregnancy ultrasound when you can ask to find out your baby’s gender—have a little fun with our Chinese Gender Predictor. There’s more! Your baby can now swallow amniotic fluid, which means the kidneys are starting to produce urine. And, did you know that your little one is starting to hear sounds from the outside world? If you haven’t already, start talking, reading, and singing to your tiny, but very appreciative audience!!
How Big Is Your Baby When You’re 4 Months Pregnant?
By the end of this month, your little one could measure about five inches long and weigh close to five ounces.
Pregnancy Weight Gain Calculator
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What Does a Fetus Look Like at 4 Months?
Check out these illustrations for a glimpse at what your baby might look like when you’re four months pregnant:
4 Months Pregnant: Your Body’s Changes
At four months pregnant, you’ve now entered the second trimester. This stage is often considered to be the “honeymoon” period of pregnancy — a time when many moms-to-be experience an energy boost. If you’re feeling a little more energetic, why not use this trimester to take on some decorating, shopping, traveling, and any other preparations that require more effort and stamina? You might be feeling great for other reasons, too. The nausea you may have experienced in the first trimester may have gone away by now, and your appetite may be back, making you feel a bit more like your old self. You can also breathe a sigh of relief because the risk of miscarriage is significantly lower from this month onward. It's a good time to relax and really enjoy your pregnancy journey. Although every mom-to-be and every pregnancy is unique, you might start showing this month if you haven’t already.
How Far Along Are You at 4 Months Pregnant?
You might see a few different breakdowns for the weeks, months, and trimesters of pregnancy. At four months pregnant, you could be launching into week 13 or week 14 and finishing the month at week 16 or 17, depending on how you're grouping the weeks into months. The second trimester usually extends from this month through month seven of pregnancy.
FREQUENTLY ASKED QUESTIONS
It’s generally safe to have routine dental procedures and dental X-rays done during the second trimester. Just remember to let your dentist know that you’re pregnant.
Checklist for When You’re 4 Months Pregnant
- Book: Your Pregnancy and Childbirth: Month to Month, Sixth Edition Paperback – January 1, 2016 by American College of Obstetricians and Gynecologists (Author)
- Mayo Clinic: Fetal development: The 2nd trimester
- Women’s health: Urinary tract infections
- NCBI: Urinary tract infections in pregnancy: old and new unresolved diagnostic and therapeutic problems
- Mayo Clinic: Gingivitis
- Mayo Clinic: Varicose veins








