11 Weeks Pregnant: Baby Development

At 11 weeks pregnant, your baby is putting the finishing touches on the most delicate stage of development. From here on, the focus shifts from building new structures to growing and refining what's already there — and for many women, this week brings the first hints of the first trimester easing off.

Baby's Development at 11 Weeks

Your baby is now about the size of a fig, roughly 4-5cm from crown to rump, and starting to look distinctly more like a tiny human on ultrasound.

Every major organ has now formed. The critical organ-forming stage of pregnancy is essentially complete — the heart, brain, kidneys, liver and lungs are all in place and will now spend the rest of pregnancy growing and maturing.
Fingers and toes are fully separated, and tiny nail beds are starting to form.
Your baby can hiccup, swallow and yawn, and may even briefly open and close their mouth — early rehearsals for feeding and breathing after birth.
The head makes up close to half of total body length at this stage, which is completely normal — body proportions will gradually even out over the coming months.
Genitals are developing, though it's still too early to reliably tell sex on an ultrasound — that typically becomes possible from around 16 weeks onwards on a scan, with more specialist assessment sometimes attempted earlier.

What's Happening in Your Body

Many women notice morning sickness starting to ease around this point, though it can persist well into the second trimester for others — every pregnancy is different.
Energy levels may slowly start improving as your body adjusts to pregnancy hormones, though tiredness can still come and go.
You might notice a faint linea nigra — a dark vertical line running down the centre of your belly — caused by pregnancy hormones increasing pigmentation.
Your 12-week scan (dating scan) is likely on the horizon, usually booked for somewhere between 11 and 14 weeks, so keep an eye out for your appointment letter if you haven't received one yet.

Preparing for Your 12-Week Scan

Bring your maternity notes and any appointment letter with you.
Most units ask you to have a comfortably full bladder, as this helps get a clearer image — check your specific letter for guidance.
This scan confirms your due date, checks your baby's development, and offers combined screening for chromosomal conditions if you choose to have it.

Frequently Asked Questions

What's happening at 11 weeks pregnant?

All of your baby's major organs have now formed and will spend the remainder of pregnancy growing rather than developing from scratch. Your baby can hiccup and yawn, fingers and toes are fully separated, and the head still looks proportionally large compared to the body. Many women also notice morning sickness beginning to settle around this stage, though this varies widely.

When does the critical development phase end?

The most delicate organ-forming period of pregnancy, sometimes called organogenesis, is essentially complete by the end of week 10 to 11. This is why the risk of certain birth defects from external factors like medications or infections is highest earlier in the first trimester. From 11 weeks onwards, your baby's job is mostly to grow, gain weight and mature the organs that are already in place.

Why does my baby's head look so big on the scan?

At 11 weeks, the head naturally takes up close to half of total body length because the brain develops earlier and faster than the rest of the body. This is a completely normal and expected part of fetal development, not a cause for concern. Proportions gradually shift as pregnancy progresses, and by birth the body will have caught up considerably.

This article is for informational purposes only and does not constitute medical advice.

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