I reported previously (Jun 2015) on the PregSense wearable fetal monitor from Israel’s Nuvo. Renamed Invu,,multi-center trials produced fetal and maternal heart rates comparable to existing standalone cardiotocographs (CTGs). US FDA review is in progress.

https://www.prnewswire.com/news-releases/nuvo-group-ltd-presents-data-on-remote-monitoring-in-pregnancy-at-the-66th-annual-society-for-reproductive-investigation-sri-meeting-300813907.html