Question: I am a teacher and I hear many times small children who are not baalig (mature) reading the verses of sajdah. My question is do I have to perform Sajdah subsequently by listening from these children?

Answer: Yes you do have to perform Sajdah tilawah even if you listen to children who are under age. This is due to the fact that listening to verse of Sajdah renders wajib upon the listeners. As you are engaged in teaching, it is most likely that you are listening to them very attentively. As a result it becomes wajib upon you.

References: [1] Badaius Sanai vol-1:440 [2] Al-Bahrur Raiq vol-2:119 [3] Ad Durrul Mukhtar vol-2:107