Wearable devices for fetus physiological condition determination

A device comprising:

• a sensor;
• at least one light source;
• a processor;
• a network communication interface;
• and
• memory;
• wherein the processor is configured to:
• generate a spectral transform from a waveform representative of a hemodynamic parameter specific to an individual, the spectral transform including a plurality of harmonics within a sampling period, the plurality of harmonics representative of the hemodynamic parameter;
• determine a plurality of candidate remnant signals included in an area independent of exclusion areas of the spectral transform;
• identify a candidate remnant signal from the plurality of candidate remnant signals;
• compare the candidate remnant signal with a target signal representative of oxygen levels present in blood stream of the individual, the target signal is derived from the hemodynamic parameter;
• and
• determine that the candidate remnant signal is associated with a heart rate of a fetus that is disposed in the individual upon identifying an inverse correlation between the candidate remnant signal and the target signal of the individual.