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We present, for the first time, the design, development and testing of a portable ultra-low<br />velocity flow sensor with a disposable architecture for use in medical applications. 3Dmicroprinting<br />technique was used to fabricate high aspect ratio microscopic hair-like structures<br />from conducting polymers, in particular, poly(3,4-ethylenedioxythiophene):polystyrene-sulfonate<br />(PEDOT:PSS). These high aspect ratio micro-hairs are flexible and conductive that can respond to<br />air flowing over them. A disposable and portable flow sensor with a modular design that allows<br />tuning of measurement range was developed, for integration with an automated neonatal<br />resuscitator to provide closed-loop feedback. The developed portable sensor architecture is capable<br />of real-time indication of the air flow velocity range down to few millimeters/second.