11-Week Scan: Complete Guide

By 11 weeks, your baby looks far more recognisably human than in earlier scans, and this is often the point where the NHS 12-week scan window officially opens. Here's what an 11-week scan typically shows and what your options are if you're considering one.

What You Can See at 11 Weeks

Development has moved on considerably from the earlier "flickering heartbeat" stage.

The baby is fully formed in outline, with all major organs, muscles, and bones present, though many are still maturing.
Fingers and toes are separated, and fingerprints have started to form.
Your baby may be moving — stretching, kicking, or even appearing to hiccup — though these movements are far too small and early for you to feel yet.
Crown-rump length (head to bottom) is roughly 4cm at this stage, about the size of a fig.
The sonographer can usually get a clear look at the heartbeat and basic structure, though the detailed anatomy check happens later, at the 20-week scan.

NHS Timing vs Private Scans

Eleven weeks sits right at the edge of the NHS dating scan window.

The NHS 12-week (dating) scan window runs from 11 weeks 2 days to 14 weeks 1 day — so at exactly 11 weeks, you may be a few days too early for your booked NHS appointment.
Most women simply wait for their scheduled NHS scan rather than seeking an extra one, since the 12-week scan covers dating, viability, and (if opted in) NT screening in one appointment.
If you want reassurance sooner — for example after previous loss, bleeding, or high anxiety — a private early or reassurance scan is an option, typically costing in the region of £60-£150 depending on the clinic and what's included.
Private clinics performing scans in the UK should be registered with the Care Quality Commission (CQC) — it's worth checking this before booking.

Nub Theory at 11 Weeks

Some parents are curious about "nub theory" — trying to guess sex from the angle of a small bud (the genital tubercle) visible on scan images around this stage.

The tubercle is visible from around 11 weeks, but it's most commonly assessed by professionals at 12-13 weeks, when it has developed further and its angle is easier to interpret.
At 11 weeks specifically, it's often still too early for a confident read, and doing this yourself from a photo is essentially a guessing game — for fun only, not diagnostic.
The only NHS-recognised way to find out sex reliably is the 20-week anomaly scan (and even then it isn't guaranteed, depending on the baby's position).
If you want a more accurate early answer, NIPT blood tests (from around 10 weeks, usually done privately or via NHS if clinically indicated) can determine sex with high accuracy through chromosomal analysis, though sex determination via NIPT is usually a secondary use of a test primarily done for chromosomal screening.

Frequently Asked Questions

What can you see at an 11-week scan?

A fully formed baby with all major organs, muscles, and bones present, plus separated fingers and toes and early fingerprints. The baby may be moving, and the heartbeat is normally clearly visible. Crown-rump length is around 4cm at this point, roughly fig-sized.

Can I try nub theory at 11 weeks?

You can look, but 11 weeks is on the early side — the genital tubercle is usually easier to assess from around 12-13 weeks. Treat any guess as a bit of fun rather than a reliable prediction; the only ways to find out sex with confidence are the 20-week scan or, earlier, an NIPT blood test.

Do I need a private scan at 11 weeks, or should I wait for my NHS appointment?

Most women wait for their NHS 12-week scan, which covers dating and screening in one visit. A private scan at 11 weeks can be worth it for extra reassurance — for example after previous pregnancy loss or if you're feeling especially anxious — but it isn't medically necessary for most straightforward pregnancies.

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

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