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Background: Indonesia still ranks in the 10th largest stunting rate in the world. Research seeks to find new approaches to improve the quality of maternal behavior in providing nutrition to babies. Purpose of this study is to know the effectiveness of Interproffesional Collaboration. Methods: The study was conducted in Karanganom Klaten, Central Java, March-August 2019. This study was an experimental study with a quasi-experimental design on 90 respondents who had babies less than 2 years. The treatment is in the form of an Interproffesional Collaboration program (doctors, nurses, midwives, nutritionists, and sanitarians) which provide health promotion programs according to their respective professions for 3 months. The research instrument was a cognitive test, a questionnaire, and a of infants under two years of ageantrompomary examination sheet. Data were analyzed using Dependent t-test. Results: The mean value of knowledge about stunting increased from 31.44 to 80.22 (p = 0.001), knowledge about how to give nutrition to of infants under two years of age increased from 48.81 to 70.74 (p = 0.001), the attitude towards stunting changed from 9.68 to 16.52 (p = 0.001), and the behavior of providing nutrition was also getting better from 76.53 to 87.73 (p = 0.001). The results of the Dependent Paired t-test p = 0.001, proved that the Interproffesional Collaboration program (nurses, doctors, midwives, nutrition, and sanitarians) was effective in increasing the knowledge, attitudes and behavior of residents in preventing the risk of stunting. Conclusion: Interproffesional Collaboration is effective to increase knowledge, attitudes, and behavior of mothers of infants under two years of age (baduta) in an effort to prevent the risk of stunting and improve the nutritional status.