Children 3-4 years old is a critical age stages that will have an effect on growth and development and its success influenced by adults especially mothers as parents. One aspect of its development at this age is the motoric. Therefore, this study aims to see the description of the mother’s knowledge about the development of children ages 3-4 years. This research uses descriptive design research with quantitative approach. Respondents of this study amounted to 80 people in the city of Padang Panjang. The technique of sampling is Random Sampling by means of Cluster Sampling. Using a detailed questionnaire data collection tools and analysis data using statistics. The results obtained that level of knowledge of the mother on the motoric aspect of 44 people (55%). Whereas in the language aspect of 45 people (56.2%) and 53 people (66.2%) simply on the psychosocial aspect. The conclusions of this research are the mother’s level of knowledge about child development in aspects of psychosocial, language and motor in the city of Padang Panjang is enough.
Keywords : Mother Knowledge, Child Development, Language, Motoric, Psychosocial.