Zaturi is a mobile system that enables parents to create an audio book for their children by utilizing their micro spare time. We define micro spare time as tiny fragments of time with low cognitive loads that frequently occur in daily lives, such as waiting for an elevator. Zaturi notifies the parent user of her micro spare time at work in real time and helps her seamlessly record the book piece by piece, so that the child can enjoy the book recorded in the parent's own voice. We develop and demonstrate the working prototype of the Zaturi system. It helps parent users develop her own feelings of parental achievement by putting her micro spare time together. More important, the use of Zaturi at work does not compromise the quality and quantity of parent users' working hours.