Does Timing Really Matter?

One of the most common questions we get at FirstGlimpse AI is: "I have an 8-week scan—will it work?" or "My 3D scan is from week 34, is that too late?" The short answer is: we can process almost any scan, but the quality of the result varies significantly depending on the gestational age when the scan was taken. This guide walks you through each key stage.

Weeks 6–10: Early Days

At 6–10 weeks, your baby is still in the embryonic phase. The facial features are forming but are not yet individually distinguishable—what the ultrasound shows is a curved mass with a head and a body, sometimes a visible heartbeat flutter. There is no distinguishable nose, lips, or eye structures at this stage.

AI Portrait Result: The AI will do its best to interpret the structural data, but because the input geometry doesn't contain clear facial landmarks, the output will be largely generated from the model's internal understanding of what a newborn looks like, rather than derived from your specific scan. Results at this stage are more "AI-generated newborn" than "portrait of your baby."

Best use at this stage: Use the other tools! Weeks 6–9 are perfect for the Ramzi Theory Calculator.

Weeks 11–14: The Nuchal Translucency Window

The nuchal translucency (NT) scan usually happens between weeks 11 and 14. By this point, the baby is recognisably baby-shaped: a head, a body, limbs, a spine. In a high-quality NT scan, you might be able to make out the profile of the face—nose bone, forehead, chin. The genital tubercle is also visible, making this the window for the Nub Theory.

AI Portrait Result: If your NT scan captured a clear profile or three-quarter face view, the AI can often produce a surprisingly compelling result. The face won't have post-newborn fat deposits (because they haven't developed yet), so the portrait may look a little thinner-faced than your actual newborn will. But the structural features—nose shape, forehead—can already be captured.

Best use at this stage: NT scan + Nub Theory Analyzer for gender prediction. Upload the best facial frame to FirstGlimpse for a first glimpse!

Weeks 20–24: The Anatomy Scan

The 20-week anatomy scan is a clinical 2D scan. It's excellent medically but typically captures cross-sectional slices through the body rather than a face portrait. However, if the sonographer took a facial profile image or a frontal face shot (common as a keepsake), this can be a usable input.

AI Portrait Result: The face at 20 weeks has all the right structures—eyes, nose, lips, ears—but hasn't yet developed the subcutaneous fat that gives newborns their characteristic chubbiness. If you have a clear facial view, the AI will capture the face's structure well, though the rendered portrait typically looks closer to a 3-month-old than a newborn at this stage.

Weeks 26–32: The Sweet Spot 🌟

This is the optimal window for an AI baby portrait, and it's not close. Here's why:

The face is fully formed with all individual features distinguishable
Fat deposits are beginning to accumulate, giving the face its characteristic roundness and softness
There is usually still enough amniotic fluid around the face to provide a clear sonic window
The baby hasn't yet descended into the pelvis, making it easier to get a clear frontal or three-quarter view
Private 3D/4D scan studios specifically target this window for their premium sessions

AI Portrait Result: The best results. The AI has rich, detailed structural information to work from, and the rendered portrait will closely resemble a newborn—rounded cheeks, soft features, realistic proportions.

Weeks 32–36: Still Good, Slightly Trickier

The face is at its most detailed in this window—fully fat-padded and looking almost exactly as the baby will at birth. However, as the baby grows larger and begins to engage in the pelvis, getting a clear frontal face view becomes harder. The head may be too deep, or the face pressed against the uterine wall.

AI Portrait Result: If you're lucky enough to get a clear face image at this stage, it can produce the most realistic results because the input geometry most closely matches a newborn's actual face. But the "if you're lucky" caveat is real.

Week 37+: Very Late Scans

At full term, most babies are fully engaged in the pelvis with very little space between the face and the probe. Getting a clear 3D image is quite difficult, and many studios won't offer 3D scanning this late. If you do have a late scan image, it's still worth trying.

Tips for Any Stage

Regardless of gestational week, these factors most affect your result quality:

Face angle: Faces looking toward the probe always produce better results than profiles
Image resolution: Request a digital export file, not a phone photo of the screen
Amniotic fluid: More fluid = clearer image. Hydrate well before your scan
Use "Fix Anatomy" for difficult scans: If hands or cord are in front of the face, our second-pass AI mode is designed to correct these

Ready to try? Upload any ultrasound scan—from 11 weeks onwards—to our AI Baby Portrait Generator and see your baby's face today.

The Best Time to Get an AI Baby Portrait: Week-by-Week Guide