My son loves the count and Oscar the grouch

Me

He doesn’t like Elmo big bird - none of the happy characters on Sesame Street. 21 months old. However, he is obsessed with the count and Oscar the grouch. At first I thought it was cute, but should I be a little concerned? His dad and I fought a lot after he was born. Mainly bc his dad thought something was wrong with him at birth and got him sent away from me to the nicu. I couldn’t see him for two whole days and I resent him for that.