Background: Research'sain is to know the influence of baby gym to the development of rude motorik and soft motorik in baby's age 4-12 months, in Kelurahan Mataram Timur, the reason is there is no research before. Methods: The researchis by using quasi experimental approach with "Pretest-Posttest with Control Group Design". Target population of health babies on 4-12 months that fill the criteria…