What Does a Baby Look Like at 28 Weeks?

Understand what a baby may look like at 28 weeks on 3D ultrasound, why the face often appears fuller, and what determines image quality.

At 28 weeks, many fetuses show a fuller facial appearance than at 20 or 24 weeks because growth and fat deposition are progressing. The nose, lips, cheeks and chin may be visually distinct on a good 3D surface rendering. This gestational period lies within a range frequently used in research on fetal facial 3D imaging. [7, 17, 18]

Educational visual for what a baby may look like at 28 weeks on ultrasound. Educational illustration; not a diagnostic ultrasound image.
Visual overview of what a 28-week ultrasound can show. Educational illustration; not a diagnostic ultrasound image.

Understand what a baby may look like at 28 weeks on 3D ultrasound, why the face often appears fuller, and what determines image quality.

Why the face looks fuller

During the late second and early third trimester, the fetus grows rapidly and begins storing more fat. The lower face also continues to change in measurable ways. A longitudinal 3D ultrasound study found gestational changes in facial measurements and noted particularly rapid growth in the lower facial area during later pregnancy. [7, 9]

Educational comparison of fetal facial change from 20 to 32 weeks, with 2D profile views and sepia 3D ultrasound surface renderings. Educational illustration; not a diagnostic ultrasound image.
Later second-trimester growth and fat stores can make the face look fuller on 3D rendering. Educational illustration of 20–32 week change with 2D profiles and 3D surface renderings; not a diagnostic ultrasound image.

Why 28 weeks often produces recognizable 3D images

The fetus is large enough for facial contours to be conspicuous, yet there may still be enough surrounding fluid and room to acquire a useful volume. Older studies described highly recognizable images from approximately 24 to 34 weeks, while newer research emphasizes that the actual success rate depends on more than gestational age. [8, 18]

What 3D ultrasound is actually showing

The familiar golden or sepia fetal portrait is a rendered surface generated from ultrasound echoes. It is not the baby's skin photographed through the uterus. Rendering choices, thresholds, shadows and missing data can change the apparent contour. A flattened nose, missing lip edge or unusually deep eye region may therefore be an imaging artifact rather than true anatomy. Diagnostic interpretation belongs to the qualified clinician reviewing the complete examination. [11, 12, 13, 14]

Educational pipeline diagram titled why a rendered 3D ultrasound can look different from a photograph, from ultrasound echoes through 2D frames, volume acquisition and surface rendering to a displayed 3D face. Educational illustration; not a diagnostic ultrasound image.
Why a rendered 3D ultrasound can look different from a photograph: echoes become 2D frames, then a volume, then a displayed surface. Educational illustration; not a diagnostic ultrasound image.

Factors that can improve or limit the view

The best surface images generally require an accessible face and a useful fluid interface in front of it. Placental position, fetal orientation, limbs near the face, motion and operator technique can alter the result. A 2026 study found placental site associated with 3D facial image quality and also emphasized the importance of technical factors and sonographer expertise. [8]

Educational diagram of factors that improve or limit a 3D facial view. Educational illustration; not a diagnostic ultrasound image.
Position, fluid, placenta, and limbs near the face still decide whether the surface is usable. Educational illustration; not a diagnostic ultrasound image.

Why a physical model should preserve uncertainty

A physical 3D representation can make spatial form intuitive because the viewer can see and touch the surface from multiple directions. But a model derived from incomplete ultrasound data should not invent anatomy that was never captured. For patient-facing applications, reconstructed or estimated areas should be distinguished from directly observed surfaces whenever clinically relevant.

Medical disclaimer

This article is intended for educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional regarding your individual medical care. This content is based on peer-reviewed scientific literature and current clinical guidelines available at the time of publication. Every article requires physician review before publication.

Key Takeaways

  • During the late second and early third trimester, the fetus grows rapidly and begins storing more fat.
  • The fetus is large enough for facial contours to be conspicuous, yet there may still be enough surrounding fluid and room to acquire a useful volume.
  • The familiar golden or sepia fetal portrait is a rendered surface generated from ultrasound echoes.
  • The best surface images generally require an accessible face and a useful fluid interface in front of it.
  • A physical 3D representation can make spatial form intuitive because the viewer can see and touch the surface from multiple directions.

Frequently Asked Questions

Why does the face look fuller at 28 weeks?

Growth and increasing soft tissue make the facial surface appear rounder than earlier in pregnancy.

Is 28 weeks a guaranteed good 3D scan?

No. Fetal position and surrounding structures can matter more than gestational age.

Can a 3D scan predict exactly what the baby will look like?

No. It is a rendered ultrasound representation, not a photograph or exact postnatal prediction.

References

  1. ACOG. Ultrasound Exams. American College of Obstetricians and Gynecologists. Standard obstetric ultrasound is commonly performed at 18-22 weeks; specialized techniques may include 3D ultrasound. https://www.acog.org/womens-health/faqs/ultrasound-exams
  2. ISUOG Practice Guidelines (updated): performance of the routine mid-trimester fetal ultrasound scan. Ultrasound Obstet Gynecol. 2022;59:840-856. https://www.isuog.org/resource/isuog-practice-guidelines-updated-performance-of-the-routine-mid-trimester-fetal-ultrasound-scan.html
  3. FDA. Ultrasound Imaging. U.S. Food and Drug Administration. Ultrasound does not use ionizing radiation; keepsake images are reasonable when produced during a medically indicated examination without additional exposure. https://www.fda.gov/radiation-emitting-products/medical-imaging/ultrasound-imaging
  4. AIUM. Prudent Clinical Use and Safety of Diagnostic Ultrasound. 2019. Supports prudent, medically appropriate use and attention to acoustic output and exposure time. https://www.aium.org/resources/official-statements/view/prudent-clinical-use-and-safety-of-diagnostic-ultrasound
  5. AIUM. Prudent Use and Safety of Diagnostic Ultrasound in Pregnancy. Official statement. https://www.aium.org/resources/official-statements/obstetric-ultrasound
  6. NHS. 20-week screening scan. The anomaly scan is usually performed between 18 and 21 weeks and assesses fetal anatomy and growth. https://www.nhs.uk/pregnancy/your-pregnancy-care/20-week-scan/
  7. MedlinePlus. Fetal development. U.S. National Library of Medicine. https://medlineplus.gov/ency/article/002398.htm
  8. Connor A, Matthew J, Chung E, Wright R, Rutherford MA. Factors influencing the successful acquisition and quality of three-dimensional souvenir obstetric ultrasound facial images: a narrative review and quantitative evaluation. Ultrasound. 2026. PMID: 42294041. DOI: 10.1177/1742271X261436619. DOI: 10.1177/1742271X261436619 PMID: 42294041 Source
  9. Accuracy and repeatability of fetal facial measurements in 3D ultrasound: A longitudinal study. Early Hum Dev. 2024. PMID: 38701668. DOI: 10.1016/j.earlhumdev.2024.106021. DOI: 10.1016/j.earlhumdev.2024.106021 PMID: 38701668 Source
  10. Three-dimensional sonographic visualization of the fetal face. AJR Am J Roentgenol. PMID: 9456969. DOI: 10.2214/ajr.170.2.9456969. DOI: 10.2214/ajr.170.2.9456969 PMID: 9456969 Source
  11. Two- and three-dimensional sonographic assessment of the fetal face. 1. A systematic analysis of the normal face. Ultrasound Obstet Gynecol. PMID: 15027008. DOI: 10.1002/uog.984. DOI: 10.1002/uog.984 PMID: 15027008 Source
  12. Diagnostic evaluation of the fetal face using 3-dimensional ultrasound. Ultrasound Q. 2008;24:215-223. PMID: 19060688. DOI: 10.1097/RUQ.0b013e31819073c2. DOI: 10.1097/RUQ.0b013e31819073c2 PMID: 19060688 Source
  13. Three-dimensional and four-dimensional ultrasound applications in fetal medicine. Curr Opin Obstet Gynecol. 2009;21:167-174. PMID: 19996869. DOI: 10.1097/GCO.0b013e328329243c. DOI: 10.1097/GCO.0b013e328329243c PMID: 19996869 Source
  14. Role of 3-D ultrasound in clinical obstetric practice: evolution over 20 years. Ultrasound Med Biol. 2015. PMID: 25748522. DOI: 10.1016/j.ultrasmedbio.2014.12.009. DOI: 10.1016/j.ultrasmedbio.2014.12.009 PMID: 25748522 Source
  15. 3D/4D sonography - any safety problem. J Perinat Med. 2016;44:125-129. PMID: 26376219. DOI: 10.1515/jpm-2015-0225. DOI: 10.1515/jpm-2015-0225 PMID: 26376219 Source
  16. 4D ultrasound study of fetal facial expressions at 20-24 weeks of gestation. Int J Gynaecol Obstet. 2014;126:275-279. PMID: 24996686. DOI: 10.1016/j.ijgo.2014.03.036. DOI: 10.1016/j.ijgo.2014.03.036 PMID: 24996686 Source
  17. Fetal face shape analysis from prenatal 3D ultrasound images. Sci Rep. 2024. PMID: 38388522. PMCID: PMC10884000. DOI: 10.1038/s41598-023-50386-9. DOI: 10.1038/s41598-023-50386-9 PMID: 38388522 Source
  18. Three-dimensional ultrasonic images of normal fetus. Study of pregnancies 20-36 weeks; satisfactory recognizable images were reported particularly from 24-34 weeks. PMID page. PMID: 11601189 Source
  19. Three-dimensional ultrasonographic assessments of fetal development. PMID: 9469279. PMID: 9469279 Source
  20. Three-dimensional reconstruction of fetal abnormalities using ultrasonography and magnetic resonance imaging. PMID: 29656679. PMID: 29656679 Source

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