Malnutrition is prevalent in developing countries including Indonesia. In more than 100 districts in Indonesia, children under five years old suffered from underweight (WAZ) at least 30 percent. Complementary food has beneficial for the children in preventing determinative condition. However, home made complementary food lack of micronutrients such as vitamin A, iron and zinc. Complementary food based on fermented soybean (tempe), coconut oil and skimmed milk so called tempe formula, has distinctive effect in improving nutritional status and recovering diarhea effectively among malnourished children. However, the effect of tempe formula on morbidity of diarhea, physical activity and growth of healthy children has not been recognized yet. This study consisted of 144 six-month old infants (SD±15 days) who was divided into two groups (72 infants each) in a double blinded RCT. One group is allocated to receive tempe formula (FT) and the other group receive non-tempe complementary food (FBT). After five-month intervention, at the endline, there were 49 infants in FT group and 45 infants in non FT (FBT). During the study the energy consumption of the infants increased according to age. The proportion of energy consumption was about 27 to 46 percent of RDA and there was no significant difference between two groups. The number of diarhea was fluctuative in the two groups, in cumulative number was 2 or 3 episodes in both groups. There was no significant difference in number of diarhea episode between the two groups and so the length of the episode (between 8 and 10 days). There was also no difference in physical activity and motoric development and growth achievement between two groups. The weight for height z-score of infants has decrease in both group. In conclusion, the study failed to show the benefical of tempe formula for healthy infants age 6-12 months in the episode and length of diarhea growth and in physical activity but showed significant improvement of ferritin level.