E-commerce (EC) has grown rapidly and the recent marketing of women and children (W&C) products has gained much attention. One survey shows W&C product sales online have doubled compared to an only 10% increase in stores. Given that W&C products characteristically have a variety of product categories and are suitable for a relatively short period of time, consumers may not have enough product knowledge to purchase appropriate products. This research proposes a timely interactive recommendation mechanism to be applied to an EC W&C product based on “age of child” as a time factor, the generation of a suitable time interval to filter the categories, and a dynamic display of categories and products. An interactive critique-based recommendation mechanism is thereby designed to help consumers identify their modified requests that reflect current dissatisfaction with a product. Through this process users can acquire product knowledge and purchase the most suitable product. An experiment based on the proposed mechanism is performed. The results demonstrate that the participants were significantly more satisfied with the proposed timely interactive recommender system than the general e-commerce, in terms of the factors of information content, personalized services, user interface, system value, and perceived system diagnosticity.