When Do You Start Showing in Pregnancy?

Is there a week when you start showing?

No. Most websites will give you a figure, usually somewhere between 12 and 16 weeks, but we could not find a national health service or professional body that puts a week on it. The NHS explains why. How big your stomach gets depends on several things at once: your hormones, your weight before pregnancy, how many babies you have already had, and the strength of your muscles.

That list is the honest answer to "when will I show?" It is why two people at exactly the same week can look completely different, and why neither of them is necessarily early or late. Australia's Pregnancy, Birth and Baby service makes the same point at 16 weeks: every pregnancy develops at its own pace, and some women show more of a bump than others.

What does follow a timetable is your womb, and from the middle of pregnancy its height is measured and plotted on a chart. The bump in the mirror sits on top of that.

Bloating first, bump later

Some of what gets called an early bump is bloating. The NHS lists "bloating and the feeling of being bloated" among the symptoms you may have at 12 weeks, and points you to its constipation advice alongside it. A tummy that is flat in the morning and round by the evening is your gut rather than your womb, which grows steadily. Our page on trapped wind and bloating in pregnancy covers what helps.

What your womb is doing, stage by stage

These are the landmarks national sources actually give. They describe the womb, not how visible it is. Our week guides for 12 weeks pregnant and 20 weeks pregnant cover the rest of what is happening then.

The international INTERGROWTH-21st study, which followed more than 4,000 healthy pregnancies in eight countries and measured them every five weeks from 14 weeks, found that this fundal height measurement increases almost linearly with gestational age. The womb grows at a steady rate. Bumps, as anyone comparing photos will know, do not.

When do you start showing in a first pregnancy?

There is no sourced week for a first pregnancy either. If your waistbands are tighter around 12 weeks, that matches what the NHS describes for that week: "your waist is probably thickening". If nobody would guess you were pregnant at 18 or 20 weeks, that does not tell you anything about your baby. The measurement that matters is the one your midwife takes, not the one other people make by looking at you.

Second or third pregnancy

"How many babies you've already had" sits on the NHS list in its own right, next to the strength of your muscles. The NHS does not say how much difference it makes or put a week on it. It is the factor people usually mean when they say they showed sooner the second time, but it is not a rule: the other factors on the list still apply, and a third bump can look nothing like a second.

Why two people at the same week look different

• Weight before pregnancy. The NHS names it as one of the things that decide how big your stomach gets.
• Muscle strength. Also on the NHS list, next to how many babies you have already had.
• Weight gain. The NHS says most women put on between 10kg and 12.5kg (22lb to 26lb), usually after week 20, and that some do not put on any weight at all.
• Hormones and bloating. Hormones are on the NHS list, and bloating, which the NHS lists among the symptoms at 12 weeks, can make your tummy look rounder than your womb is.
• Number of babies. Twin pregnancies are measured and monitored differently. Our page on when you start showing with twins covers them separately.

How your midwife checks your bump

In the UK, NICE recommends offering a symphysis fundal height measurement, from the top of the pubic bone to the top of the womb, at each antenatal appointment after 24 weeks, but no more often than every 2 weeks, and plotting it on a growth chart. It does not apply if you are already having regular growth scans.

On the NHS schedule your bump is measured at the 25-week appointment if this is your first baby, then at 28 weeks, at 31 weeks for a first baby, and at 34, 36, 38, 40 and 41 weeks. From 36 weeks the midwife also feels your bump to check which way your baby is lying.

If the measurement raises a concern that your baby is small, NICE says to offer an ultrasound scan, with the urgency depending on other findings such as reduced movements or raised blood pressure. If it suggests your baby may be large for gestational age, NICE says to consider a scan. Our fundal height by week checker shows what a measurement means, and the growth scan page explains what happens at the scan itself.

Notice what is not a trigger: how big you look. NICE's prompts are the tape measure and the clinical picture.

When to call your midwife about tummy pain

The size of your bump is not an emergency. Pain can be. The NHS says to call your maternity unit immediately if you have stomach pain and any of these:

• vaginal bleeding or spotting
• regular cramping or tightenings
• lower back pain
• vaginal discharge that is unusual for you, or fluid leaking from your vagina
• pain when you pee, or needing to pee suddenly or more often than usual
• pee that looks cloudy, pink, red or brown
• stomach pain that is severe or does not go away after you have rested for 30 to 60 minutes

If you are less than 20 weeks pregnant, the NHS says you may need to contact your GP or an early pregnancy unit instead, depending on what is available where you live. If your maternity unit is not available, call 111.

Frequently asked questions

When do you start showing in your first pregnancy?

We found no national health body that gives a week; the 12 to 16 weeks quoted online is not from one. The NHS says bump size depends on your hormones, pre-pregnancy weight, previous babies and muscle strength. Around 12 weeks your waist is probably thickening; by about 20 weeks the top of your womb usually reaches your belly button.

When do you start showing in a second or third pregnancy?

The NHS lists how many babies you have already had as one of the factors in how big your stomach gets, alongside muscle strength, but it does not say by how much or put a week on it. It is the factor people usually have in mind when they say they showed sooner.

Is it a baby bump or just bloating?

Early on, it can easily be bloating. The NHS lists bloating among the symptoms you may have at 12 weeks. A bump that changes size through the day is your gut. The womb's own growth is steady, and it usually reaches your belly button around 20 weeks.

When do you start showing signs of pregnancy?

Signs, as opposed to a bump, come much earlier. The NHS says early symptoms usually start when you are around 4 to 6 weeks pregnant, and lists a missed period, feeling sick, tiredness, sore breasts, needing to pee more often, a metallic taste and new food cravings among them. A visible bump comes weeks to months later.