16 Weeks Pregnant: Symptoms, Baby Size & What to Expect

At 16 weeks pregnant, your baby is about the size of an avocado, and the ears have developed enough that your baby may be able to hear your voice for the first time. Even though the eyes are still closed, they can react to light. And for some people — especially in a second or later pregnancy — this is the week the very first flutters of movement, called quickening, start to show up.

If your dates feel confusing, remember that gestational age counts from the first day of your last period (LMP), not from conception — so "16 weeks pregnant" usually means about 14 weeks since ovulation. For the full timeline, see our pregnancy week-by-week guide, or find out exactly how your due date is calculated. If you're picking up from last week, catch up on 15 weeks pregnant first.

Key takeaways

• Baby is about the size of an avocado (roughly 18.6 cm, head to heel) and weighs around 146 grams.
• Ears are developed enough to hear your voice, and eyes can react to light even while closed.
• Some people — often those in a second or later pregnancy — start feeling the first faint flutters of movement (quickening) around now.

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What "16 Weeks Pregnant" Actually Means

Using standard gestational dating, week 16 starts about 14 weeks after ovulation, placing you in the heart of the second trimester. In fetal-age terms (counting from conception rather than your last period), this is closer to "14 weeks post-conception."

Quickening — the medical term for the first fetal movements you can actually feel — has a wide window. Most first-time parents don't notice it until somewhere between weeks 18 and 20, but the broader range spans roughly weeks 13 to 25, and people in a second or later pregnancy often recognize the sensation earlier simply because they know what to look for.

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Baby Size at 16 Weeks

At 16 weeks, your baby is about the size of an avocado — roughly 18.6 centimeters long, measured head to heel, and weighing around 146 grams. (Source: Cleveland Clinic)

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Ears Develop Enough to Hear Your Voice

This week, the ears have moved into a more developed position and are functional enough that your baby may begin picking up sounds — mostly lower-frequency, internal sounds like your voice and heartbeat, since it will be a few more weeks before muffled outside noises come through clearly. The eyes, while still fused shut, can now sense and react to light shone against your belly.

The placenta also continues maturing this week, handling more and more of the hormone production that supports the pregnancy. It isn't considered fully formed until somewhere around weeks 18 to 20, but it's doing the majority of the heavy lifting well before then. Meanwhile, the skeleton — which started hardening from cartilage into bone a couple of weeks ago — continues that process throughout the body.

Why this matters for prenatal care. With hearing and light sensitivity developing, this is a nice week to start talking or reading out loud if you're interested — though there's no requirement to. (General guidance — confirm specifics with your provider: ACOG)

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What You Might Notice at 16 Weeks Pregnant

For many people, week 16 continues the steadier stretch of the second trimester, with a few new sensations starting to show up. Here's what commonly shows up:

Possible first flutters. As covered above, some people — often in a second or later pregnancy — start noticing very faint movement around now.

A more defined bump. The uterus is now roughly at the level of the belly button on its way up, making a bump more visible for many people.

Steadier energy and appetite. Many people continue to feel more like themselves compared to the first trimester.

Round ligament twinges. Occasional light pulling or twinging sensations low in the abdomen remain common as the uterus keeps expanding.

Backaches. As the growing uterus shifts your center of gravity, mild lower back discomfort can become more noticeable.

Nasal congestion. Pregnancy rhinitis, caused by increased blood flow to nasal passages, can continue or newly appear around this stage.

Leg cramps, particularly at night, are common for some people as pregnancy progresses.

It's also completely normal to have few or no symptoms yet. Symptom timing and intensity vary widely from person to person and even between pregnancies for the same person.

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What's Happening in Your Body

• Ears develop enough to hear. As covered above, your baby may start picking up your voice.
• Eyes react to light, even though they remain closed.
• The placenta continues maturing, handling more hormone production each week.
• The skeleton keeps hardening from cartilage into bone throughout the body.
• The uterus reaches roughly belly-button height, making a bump more visible for many people.

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Tips for Week 16

Keep taking your prenatal vitamin with folic acid. Continued organ maturation still depends on steady nutrition.

Talk or read out loud if you're interested. Your baby's ears are developed enough to start picking up your voice.

Stretch or use a heating pad for backaches, checking with your provider on what's safe.

Try a saline rinse for nasal congestion, which is generally considered safe during pregnancy.

Stay hydrated and stretch before bed if leg cramps are showing up.

Avoid alcohol, tobacco, and unapproved medications. These guidelines continue through the second trimester.

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Tips for Partners

• Try talking to the bump — your baby's ears are developed enough now to start picking up voices.
• Ask if they've felt any flutters yet, without worrying if the answer is no — the timing varies widely.
• Offer a back rub or heating pad if backaches are showing up.
• Keep supporting healthy sleep, since leg cramps can start disrupting rest for some people around now.

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FAQ

How big is my baby at 16 weeks pregnant? About the size of an avocado — roughly 18.6 centimeters long, measured head to heel, and weighing around 146 grams.

Can my baby hear me at 16 weeks? The ears are developed enough to pick up lower-frequency internal sounds like your voice and heartbeat, though it will be a few more weeks before outside noises come through clearly.

When will I feel my baby move? Most first-time parents notice the first flutters somewhere between weeks 18 and 20, though the broader range spans roughly weeks 13 to 25, and people in a second or later pregnancy often notice it earlier.

Is the placenta fully formed at 16 weeks? Not quite — it's doing most of the hormone production by now, but it isn't considered fully formed until somewhere around weeks 18 to 20.

What symptoms are normal at 16 weeks pregnant? Possible first flutters, a more defined bump, round ligament twinges, backaches, nasal congestion, and leg cramps are all common at this stage.

When is my next prenatal appointment likely to be? Many providers continue with appointments roughly every four weeks through the second trimester, though your provider will confirm your specific schedule.

When is the anatomy scan usually scheduled? Most providers schedule it between weeks 18 and 22, often around week 19 or 20.

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Pregnancy Checklist at Week 16

• Keep taking a prenatal vitamin with folic acid daily
• Talk or read out loud if you're interested — your baby may be able to hear you
• Stretch or use a heating pad for backaches, with your provider's OK
• Try a saline rinse if nasal congestion shows up
• Stay hydrated and stretch before bed if leg cramps appear
• Avoid alcohol, tobacco, and check any medications with your provider
• Confirm the timing of your anatomy scan with your provider

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Related guides

• 15 Weeks Pregnant: Symptoms, Baby Size & What to Expect — what happened the week before, as the skeleton began hardening
• Pregnancy Week by Week: A Complete Guide — see what happens in every week and trimester, from implantation to full term
• How Is Your Due Date Actually Calculated? — the exact formula behind your due date, plus a free calculator

Week 16 brings one of the more exciting developments yet — your baby's ears are developed enough to hear your voice, and for some people, the very first flutters of movement start to show up.

Read related post: 15 Weeks Pregnant: Symptoms, Baby Size & What to Expect