Tone of voice and body language give clues about how a young one feels. Asking questions is also important.
فَنَبْرَةُ ٱلصَّوْتِ وَلُغَةُ ٱلْجَسَدِ تُخْبِرَانِكُمُ ٱلْكَثِيرَ عَمَّا يَشْعُرُونَ بِهِ .‏