The aim of this clinical pilot study is

1. to evaluate the ability of the wearables to detect fetal heart rate
2. to evaluate the ability to distinguish the fetal ECG from the ECG of the mother

The participating pregnant women will wear the Polar wearables (chest band, smart watch, arm band) for 15 minutes during of which, the data will be collected with all three wearables and patient monitor (reference device). The data from the wearables will be compared with the patient monitor data referred as golden standard. Background information will be collected with questionnaires from the participants. The data collection will be conducted in hospital environment.

Inclusion Criteria:

• duration of pregnancy at least 29+0 weeks
• single pregnancy
• age at least 18 years
• ability to participate in Finnish. No exclusion criteria

Pregnant women recruited for the study are registered at the hospital ward for pregnant women. The data collection will be conducted after the routine fetal monitoring and will not affect normal monitoring practices.