Declining birthrate has become a serious issue impacting current society, because of that, every baby is the most precious member of the family and attracting all the attraction of his or her parents. In current society, the traditional thought of "Man are breadwinners and women are housewives" has been different, and more and more families are dual-earner households. Therefore, parents now have less time to take care of their child (ren). Taking bath has been considered a good time for parent(s) to interact with their child (ren). In order find out if an interactive toy can used to improve the quality of parents-child interaction during bath time. This project, we developed and created an interactive toy that can be operated by a smartphone application to improve parents-child interaction.