This disclosure pertains to stimulation and monitoring devices for in utero cognitive stimulation of and interaction with developing fetuses by synthesizing sounds and sound patterns derived from movements of the fetuses' bodies and appendages. The exemplary stimulation and monitoring devices comprise arrays of sensors positionable above and/or the sides of the womb for detecting and recording movements of the fetus's body and appendages, one or more speakers, a microprocessor, controls, and optionally one or more light-emitting components. The collected movement data may be processed by a synthesizer for production of sound patterns and light patterns that are correlated with the movement data. The sound patterns and light patterns produced by the synthesizer may be transmitted through the speakers and the light-emitting components toward and into the womb to provide the development fetus with immediate cognitive stimulation in response to the movements of their body and appendages.
