In this Study material, it is mentioned that the भाववाचक संज्ञा of बचपन is बचपना. बचपन is already भाववाचक संज्ञा. I have read in my textbook that the भाववाचक संज्ञा of बच्चा is बचपन. So, how is it possible? Kindly clarify.
you see... बचपन is also भाववाचक संज्ञा as well as बचपना .... we only use it in different forms...
i.e. example
1. mera bachpan bahut suhanna tha
2. tum bahut bachpana karte ho