Improving teacher's professionalism to create Child-Friendly Schools plays a very important role. One way to upgrade this ability is through Professional Teacher Education (PPG) program. The objective of this research is to measure the level of effectiveness of the programto increase teacher's professionalism in order to create Child-Friendly Schools and to find determinants for the program effectiveness, namely, teacher's commitment, autonomy, and self-development. The research obtained data from 31 teacher participants of the program. This research is the inferential quantitative research. The data collection was done by a scoring scale consisting of 23 items already tested valid and reliable. Data processing used SPSS version 20. This research revealed that the level of effectiveness of the PPG program, which was administered by Rayon 112 State University of Semarang in the effort of improving the teachers' professionalism to create Child-Friendly Schools, was at the high level; and two models of internal factors were also found, i.e., (1) self-development and (2) teachers' autonomy at the same time. Teacher's commitment, however, was excluded from the model.