Tracks baby heart rate and oxygen via sock sensor. FDA-cleared.
The Owlet Smart Sock wraps around a baby's foot and uses pulse oximetry to track heart rate and oxygen levels in real time, sending alerts to parents' phones if readings fall outside preset ranges. After a brief FDA dust-up in 2021, Owlet returned with updated clearances and remains the go-to for anxious first-time parents who want data-driven peace of mind.

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