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17 Weeks Pregnant: Rolling, Flipping, and the First Flutters

Medically reviewed by

Verena Brehm, Midwife Jul 29, 2026

Line illustration of a pear: at 17 weeks pregnant your baby is about the size of a pear, roughly 12 to 14cm crown to rump

Line drawing of a 17-week foetus mid-roll, more active, with long slim limbs and forming toenails

Line drawing of a woman's torso at 17 weeks pregnant, showing the uterus risen toward the navel with a clear bump

Your baby is the size of a

Pear

Between ~110 and 200 grams (Mayo Clinic week-16 to week-18 bracket)

~12–14 cm / ~4.7–5.5 in

Key Takeaways

At 17 weeks pregnant, your baby's toenails are developing and the baby is "becoming more active, rolling and flipping," per Mayo Clinic. Mayo places your baby between week 16 (about 120mm, 110g) and week 18 (about 140mm, 200g).

You may not feel those rolls yet. The SOGC notes some women feel movement as early as 13 to 16 weeks, while first-time mothers "may not feel movement until 18-20 weeks" — so a quiet belly this week is normal.

Your needs stay raised this trimester. SOGC advises about 340 extra calories per day and 27mg of iron daily, and staying active with at least 150 minutes of moderate activity each week.

Your Baby at 17 Weeks: Development & Growth

At 17 weeks pregnant, your baby's toenails start developing, and the baby is "becoming more active, rolling and flipping," according to Mayo Clinic. Mayo Clinic gives no length or weight this week, so your baby measures somewhere between its week-16 figure (about 120 millimetres crown to rump, 110 grams) and its week-18 figure (about 140 millimetres, 200 grams). You may feel the baby hiccuping, which causes small jerking movements.

Small, specific things are happening this week. Mayo Clinic notes that at 17 weeks, "toenails start developing" — the same tiny nails you'll one day struggle to trim.

Your baby is also more active now. Mayo Clinic describes the baby as "becoming more active, rolling and flipping," and adds that "although you might not be able to feel those movements yet, you may feel your baby hiccuping, which causes small jerking movements." That fluttery, rhythmic twitch some women notice is the hiccups.

On size, it's worth being straight with you. Mayo Clinic does not publish a length or weight for week 17 — it gives figures for week 16 (about 120 millimetres crown to rump and 110 grams) and week 18 (about 140 millimetres and 200 grams). Your baby this week falls between the two: roughly 12 to 14 centimetres, about the length of your hand. Length is still measured crown to rump at this stage, because the legs stay curled.

What comes next builds on this. Mayo Clinic notes that by week 18 the ears "start to stand out on the head," the baby "might begin to hear sounds," and the digestive system "has started working." The groundwork this week leads straight into it.

Your Body at 17 Weeks: Symptoms & Changes

At 17 weeks pregnant, many women feel steady in the second trimester, though tender breasts, backaches, headaches, constipation, mood swings and leg cramps can carry on. The Society of Obstetricians and Gynaecologists of Canada (SOGC) reminds us that "every pregnant woman is different." You may or may not feel movement yet — SOGC notes first-time mothers "may not feel movement until 18-20 weeks."

The big question this week is often about movement. SOGC explains that "some women feel movement as early as 13-16 weeks from the start of their last period," but "first-time moms may not feel movement until 18-20 weeks." Both are normal.

If you have felt something, it may be hard to name. SOGC notes that "at first it will be difficult to distinguish between fetal movement and intestinal gas," but "after a while, you will be able to feel a pattern in the movements." A faint bubble or flutter is often the start.

Your body is still doing steady work underneath it all. SOGC explains that weight gain "isn't just the baby" — "your placenta, increased blood volume, larger breasts, and fat stores to support breastfeeding, also contribute." For a woman starting at a healthy weight, SOGC's guidance is an average of about 0.4kg a week through the second and third trimesters.

Older symptoms may still be around. SOGC lists tender or swollen breasts, constipation, gas and bloating, backaches, headaches, mood swings and leg cramps among the common discomforts of pregnancy — any of which can be part of your week 17.

Fortunately, women tend to feel more positive during this week as their energy and sense of well-being return, even though the fact that fetal movements cannot yet be felt can occasionally lead to worry. The SOGC notes that mood swings are common and "not usually severe," but adds that "depression or disruptive mood swings are not normal and it is important to seek help for these more serious concerns." Persistent low mood is a reason to talk to your health care provider, not to wait it out.

And if you feel barely anything this week? That's normal too. SOGC puts it simply: "Every pregnant woman is different. Some will sail through pregnancy with very few symptoms, and others will be dogged with multiple discomforts throughout the 9 months."

What to Do at 17 Weeks Pregnant

NUTRITION AT 17 WEEKS PREGNANT

Keep adding about 340 extra calories a day. SOGC states: "In the second trimester you need about 340 extra calories per day." It notes this "generally equates to 2 or 3 additional servings from any of Canada’s Food Guide’s food groups" — for example a piece of toast and a cup of milk, or an apple and ¾ cup of yogurt.
Stay on top of iron. SOGC advises increasing "your daily iron intake to 27mg daily during the final six+ months of pregnancy to support an increase in red blood cells and fetal tissues," and notes that, "like most women, you may need a good supplement to meet this need."
Build meals around variety. SOGC points to Canada’s Food Guide, noting that "a varied, nutrient-dense diet" helps meet the needs of both you and your baby — with attention to fibre (aim for 28g daily), omega-3 DHA (aim for 1.4g daily) and iodine (aim for 250mcg daily).
Include folate-rich foods and foods fortified with folic acid. Note that folate-rich foods don’t replace supplements. The Public Health Agency of Canada lists corn, oranges, beans, lentils and dark green vegetables like peas, spinach, broccoli and brussels sprouts as sources of folate — while stressing that "dietary sources on their own are not enough" to protect against neural tube defects.

WHAT SUPPLEMENTS TO TAKE AT 17 WEEKS PREGNANT

Keep taking 400mcg of folic acid daily. The Public Health Agency of Canada recommends "a daily multivitamin with 400 mcg (0.4 mg) of folic acid" for anyone who could become pregnant, and advises you "continue taking folic acid throughout your pregnancy and while breastfeeding."
Don’t raise the dose on your own. The Public Health Agency of Canada advises: "You should not increase your dose of folic acid beyond 1 mg per day without talking to your health care provider."
Use a prenatal that covers iron. SOGC notes that, like most women, you "may need a good supplement" to reach 27mg of iron a day — the second and third trimesters are when this matters most.

LIFESTYLE TIPS AT 17 WEEKS PREGNANT

Keep moving — aim for at least 150 minutes a week. SOGC advises that "pregnant women should accumulate at least 150 minutes of moderate intensity physical activity each week," spread across "at least 3 days a week, and up to 7 days a week." Walking, swimming and stationary cycling are all good options, but reduce activity if you’re experiencing physical discomfort.
Notice your baby’s rhythms as they emerge. SOGC explains that "your perception of your baby’s movements is one of the strongest indicators of your baby’s wellbeing," and that "mothers should always trust their intuition if they are concerned about their baby at any time during pregnancy." Formal kick counts come later, but paying attention now is a good habit.
Keep caffeine to 300mg a day. Health Canada recommends a maximum daily caffeine intake of 300 mg for people who are pregnant. Health Canada puts one 8oz (237ml) cup of brewed coffee at about 135mg — so roughly two cups is the ceiling, and that total includes tea, cola and chocolate.
Check any medication with your provider. SOGC advises that "ideally, you should not take any medication during pregnancy unless you and your health care provider determine that it is necessary" — and warns that "although a product may be considered natural, it still can contain ingredients that could harm your baby. Always talk to your health care provider first."

When to Contact Your Doctor or Midwife

Most of week 17 is uneventful, and that is the point. But some symptoms should always be checked. Contact your doctor, midwife or other health care provider if you experience:

Any vaginal bleeding. SOGC advises: "It's important for you to take any vaginal bleeding seriously. Contact your health care provider as soon as you notice any bleeding." It notes that about one-third of pregnancies have some bleeding before the 20th week, and about half of these continue without further issues — but it should always be assessed.
Signs of infection, or heavy bleeding. SOGC advises that if you have "signs of infection like fever or heavy bleeding, you should see your care provider right away." If bleeding is heavy or you feel very unwell, seek emergency medical care immediately.
Any worry about your baby's movement. SOGC states that "mothers should always trust their intuition if they are concerned about their baby at any time during pregnancy," and that "if you ever have concerns regarding your baby's movement pattern, you should have the baby assessed as soon as possible." (Formal kick counts are a later-pregnancy tool, but the instinct to check is right at any stage.)
Persistent low mood or disruptive mood swings. SOGC advises that "depression or disruptive mood swings are not normal and it is important to seek help for these more serious concerns."
Severe abdominal pain, or any symptom that frightens you. Sudden, severe pain warrants urgent assessment — seek emergency medical care immediately if it is intense or you feel faint. For anything that simply worries you, your health care provider is there for exactly that.

Frequently Asked Questions

How big is my baby at 17 weeks pregnant?

Mayo Clinic does not give a length or weight for week 17. It publishes figures for the weeks on either side: at week 16, your baby is "about 4 3/4 inches (120 millimeters) long from crown to rump" and "about 4 ounces (110 grams)"; by week 18, "about 5 1/2 inches (140 millimeters)" and "7 ounces (200 grams)." So at 17 weeks, your baby sits between the two — roughly 12 to 14 centimetres crown to rump, and between about 110 and 200 grams. Length is measured crown to rump at this stage because the legs are still curled.

Can I feel my baby move at 17 weeks pregnant?

Maybe, maybe not — both are normal. The Society of Obstetricians and Gynaecologists of Canada (SOGC) notes that "some women feel movement as early as 13-16 weeks from the start of their last period," while "first-time moms may not feel movement until 18-20 weeks." Mayo Clinic adds that at 17 weeks your baby is "rolling and flipping," but "you might not be able to feel those movements yet" — though you may feel the baby hiccuping. If you’ve felt nothing this week, it is not a cause for concern on its own.

What’s happening with my baby at 17 weeks pregnant?

According to Mayo Clinic, at 17 weeks "toenails start developing," and your baby is "becoming more active, rolling and flipping." You may also "feel your baby hiccuping, which causes small jerking movements." The following week, per Mayo Clinic, the ears start to stand out, hearing begins, and the digestive system starts working.

How much caffeine is safe at 17 weeks pregnant?

Health Canada recommends a maximum daily caffeine intake of 300 mg for people who are pregnant. Health Canada puts one 8oz (237ml) cup of brewed coffee at about 135mg, so roughly two cups a day is the ceiling — and that total should include tea, cola and chocolate, which also contain caffeine.

How much weight should I be gaining at 17 weeks pregnant?

It depends on your weight before pregnancy. The Society of Obstetricians and Gynaecologists of Canada (SOGC) gives targets by pre-pregnancy BMI; for a woman in the 18.5 to 24.9 range, the guidance is an average of about 0.4kg a week in the second and third trimesters, for a recommended total of 11.5 to 16kg. SOGC notes weight gain "isn’t just the baby" — the placenta, increased blood volume, larger breasts and fat stores all contribute. If your gain is outside the recommended range, SOGC advises talking to your health care provider.

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