Baby Monitoring in Real Time: Innovative Technology Promises to Detect Complications Earlier

What if your baby could be monitored 24 hours a day inside the womb? Scientists have developed a smart ultrasound patch that tracks fetal movements and blood flow in real time, and has already helped doctors identify a serious complication that could have cost a life.

Monitoring the baby's health during pregnancy is one of the most important tools in modern medicine. Currently, ultrasound exams allow us to observe fetal growth, assess organs, measure blood flow, and identify potential complications.

However, there is a significant limitation: these exams only provide a "snapshot" of a specific moment. Between appointments, important changes can occur without being detected. Now, scientists have developed a technology that promises to completely change this reality.

Researchers at the University of California, San Diego, have created a flexible ultrasound patch that can be worn directly on the pregnant woman's belly for several hours at a time. Unlike traditional ultrasound, which requires a trained professional to hold and move a probe manually, the new device remains attached to the skin and continuously monitors the baby in real time.

This means that doctors will be able to monitor not only the baby's condition at a given moment, but also their behavior over several hours or even during normal daily activities.

The ultrasound sticker is made of soft material that can be easily bent. Credit: Geonho (Tom) Park. UC San Diego

To understand the importance of this innovation, it is necessary to compare it with the conventional method. In a traditional ultrasound, the pregnant woman goes to the office, the professional positions the probe and performs an assessment that usually lasts a few minutes. If the baby is in an unfavorable position or a problem occurs outside that range, it may not be observed.

Furthermore, repeated exams require travel, expensive equipment and specialized professionals. The new adhesive attempts to resolve precisely these limitations by allowing prolonged and practically automatic monitoring.

One of the biggest challenges in developing this technology was the fact that babies constantly move inside the uterus. The umbilical cord also changes position several times throughout the day. To overcome this problem, researchers incorporated artificial intelligence systems capable of automatically identifying and tracking blood vessels and the umbilical cord in real time.

Instead of relying on a technician to manually reposition the probe, the system itself "learns" where to look and continually adjusts its measurements.

Fetal Monitoring in High-Risk Pregnancies Using a Portable Ultrasound Patch

To test whether the technology actually worked, researchers conducted a large clinical study involving 62 pregnant women. Participants included women with pregnancies considered normal as well as pregnant women with higher-risk conditions, including hypertension, pre-eclampsia, gestational diabetes, and fetal growth abnormalities.

For several hours, the patch collected information about the baby's anatomy and blood flow between the placenta and the fetus. This data was then compared to results obtained by conventional ultrasound equipment used in hospitals.

The results were quite promising. The patch produced measurements very similar to those obtained by traditional equipment. But the most interesting finding was that continuous monitoring allowed for the observation of dynamic changes in blood flow that would normally go unnoticed in quick examinations.

In one of the cases monitored, the system identified a persistent alteration that led doctors to perform an emergency premature delivery at 29 weeks of gestation. According to researchers, this early detection may have been crucial in saving the baby's life.

Scientists believe this technology could be especially useful in high-risk pregnancies, where rapid changes can endanger both mother and baby. Furthermore, it could benefit regions with limited medical resources, where ultrasound specialists are not always available. In the future, the team intends to further miniaturize the system, making it completely wireless and connected to digital platforms that allow for remote monitoring.

Although further studies are needed before widespread adoption, the new patch represents a significant shift in how medicine monitors pregnancy. Instead of sporadic assessments in doctor's offices, the technology could pave the way for continuous monitoring, allowing for the identification of early signs of fetal distress and intervention before serious complications arise.

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Fetal monitoring for high-risk pregnancies using a wearable ultrasound patch

Geonho Park, Yizhou Bian, Hao Huang, Sai Zhou, Siyu Qin, Muyang Lin, Xinyi Yang, Aaron Lee, Anand Ramkumar, Mariana Tome, Jayne Lander, Xiangjun Chen, Shenghan Wang, Pranavi Bheemreddy, Liam Stanton, Ren Sheng, Guihuan Guo, Mabel Shehada, Ruotao Wang, Alexa Roa, Chengchangfeng Lu, Wentong Yue, Ray S. Wu, Xiaoxiang Gao, Hongjie Hu, Amer Yaghi, Mark Liu, Lawrence Impey, Sally L. Collins, Aris T. Papageorghiou, Louise C. Laurent, Keith A. Wear, Antoniya Georgieva, and Sheng Xu

Nature Biotechnology. 26 May 2026

DOI: 10.1038/s41587-026-03140-1

Abstract: 

Ultrasonography is widely used for fetal monitoring but it requires sonographers and is limited to snapshot evaluations at discrete intervals. Here we report a wearable ultrasound patch (UPatch) for continuous and autonomous fetal monitoring. The UPatch can acquire anatomical structures and blood flow velocities, demonstrating good agreement with a handheld clinical ultrasound device on 62 pregnancies. Real-time image segmentation allows autonomous tracking of target vessels to acquire continuous blood flow spectra during fetal and maternal movements without a sonographer. Continuous monitoring data from 52 pregnant women aligned with stratified perinatal conditions, including healthy, small for gestational age, large for gestational age, gestational diabetes, preeclampsia and gestational hypertension. With further technology development, integration with a miniaturized circuit could enable fully wireless operation and greater user mobility. The UPatch could provide continuous assessment of fetal compromise in high-risk pregnancies, expanding prenatal-care capabilities.