16 Weeks Pregnant
second trimester · Month 4
24 Weeks to Go!
Baby is as long as a avocado
Key Takeaways
- Eyes functional (though still sealed); face expressive
- Baby can hear muffled sounds — your voice reaches them
- Movement strong enough that mom usually feels it this week
16 Weeks Pregnant
Baby’s Development
Your baby is now about 11.6 centimeters long — around the size of an avocado — and weighs roughly 100 grams [1]. The eyes are functional now, though still sealed, and can sense light while moving side to side. Your baby’s ears are developed enough to hear — muffled versions of your heartbeat, your voice, your digestive gurgles, and even external sounds like loud music or your partner’s voice. Those facial muscles are remarkably active too, with your baby grimacing, squinting, frowning, and possibly even smiling. The skeleton continues to ossify, and the nervous system is now functional enough to produce coordinated movements. Your baby’s grip is even strong enough to hold the umbilical cord. You can expect distinct kicks, stretches, and somersaults this week [2].
Pregnancy Symptoms
Your energy is likely high and your symptoms generally mild this week. You may still notice round ligament pain, a backache, heartburn, constipation, bloating, headaches, leg cramps, nasal congestion, and occasional nosebleeds. For many, this is the week of quickening — those first flutters and kicks. “Snissing” (that sneeze-plus-pee combo) is common, and your sex drive is often strong. On the skin front, you might see the linea nigra, melasma, or the “mask of pregnancy,” while your hair grows thicker and your nails faster. Heartburn may worsen as your uterus pushes against your stomach [2].
Body Changes
Your uterus is about halfway between your pubic bone and your navel, and a weight gain of 5 to 10 pounds by week 16 is typical. Your bump is likely visible now. You might notice small blue veins on your breasts or legs, along with possible spider veins or varicose veins. Your breasts may be up 1 to 1.5 cup sizes, and heartburn can become persistent. You may also glimpse the first signs of stretch marks [2].
Tips for Week 16
- Consider the quad screen (15 to 22 weeks) — this optional test screens for neural tube defects as well as trisomy 21 and 18. If you’ve already done NIPT, it’s often skipped. Talk it through with your OB.
- Schedule your anatomy scan (18 to 22 weeks) — this is your most detailed ultrasound, checking the brain, heart, spine, kidneys, limbs, and often revealing your baby’s sex at 18 weeks or beyond.
- Start talking and singing to your baby — at 16 weeks, they can hear you. It builds voice recognition, language exposure, and oxytocin for both of you, and it doesn’t need to be elaborate.
- Document your quickening — jot down the date, time, and what it felt like. Many parents forget the exact first-kick moment, so journaling now is a gift to your future self.
Things To Do (Checklist)
- Decide on quad screen (vs. NIPT only)
- Schedule anatomy scan for 18-22 weeks
- Start daily “talk to baby” practice
- Journal first quickening date
- Discuss sex reveal preferences with partner
Frequently Asked Questions
Q: When will my partner feel the baby kick? A: Typically between 24 and 28 weeks, after the anatomy scan. A hand on your belly can usually feel it by then. Timing also depends on placenta position — an anterior placenta (at the front) tends to muffle the kicks [1].
Q: Why am I snoring? A: It’s likely pregnancy rhinitis — rising estrogen causes the tissues in your nose to swell. Saline spray, a humidifier, and pregnancy-safe decongestants (with your provider’s okay) can help [2].
Q: Is it OK to have sex? A: Yes, in a low-risk pregnancy you can throughout. Some people notice mild cramping afterward from orgasm contractions. Stop if it becomes painful, if you bleed, or if your provider has restricted it [1].
For Dads
- Talk to your baby every day — even 30 seconds counts. Read a book, share your day, or sing a song. They’ll begin to recognize your voice after weeks 25 to 30, and it builds a bond long before birth.
- Keep a hand on her belly during quiet moments — and be ready for that first kick. The moment you feel it is a different kind of “this is real.”
- Make a “first kicks” record — note the date, time, what she felt, and your reaction. A photo or screenshot of the moment will mean a lot to future you.
- Read The Expectant Father, Chapters 9-10 — they cover the deepening of the second trimester and your growing relationship with the baby.
- Pray for hearing and recognition — the voice, language, and brain-ear connections are all forming right now.
Sources
- ACOG — How Your Fetus Grows During Pregnancy
- Mayo Clinic — 16 Weeks Pregnant
- Expecting Better — Emily Oster (Chapters 9-10: Second Trimester)
Sources
- guideline ACOG — How Your Fetus Grows During Pregnancy
- medical Mayo Clinic — 16 Weeks Pregnant
- book Expecting Better — Emily Oster
Your Checklist
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Action Plan Items for Week 16
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