In the current era, it is a time where technology is growing so that technology users can more easily search for many things, both nationally and internationally, with ease and in a short time. This results in a change in the mindset and behavior of humans. One of the technological tools that influence human behavior is a gadget. Gadget is a technological tool that can be used to find information and communicate. Gadgets not only change the behavior of adults but children as well. Early childhood tends to like new things and interesting games that he can find in gadgets. At this time children spend more time with gadgets which will certainly affect children's development, especially in children's cognitive development. Parents must supervise the use of gadgets by children so that the negative impacts caused by gadgets can be avoided. The purpose of this study is to describe the use of gadgets on early childhood cognitive using the literature study method. The literature study uses reference sources, namely articles, journals, and documents that are relevant to the problem to be studied by the researcher. The results of this study are that the gadget facilities provided by parents for early childhood really need close supervision so that the impact of gadgets does not have a negative impact that can hinder children's cognitive development. So, parents can make gadgets as a fun learning medium for children that can improve their cognitive abilities.