Can i give my 9 month baby a piece of dark choccolate, some nutella as a treat?

May be: You possibly could, but most pediatricians feel you child should be one year or older before you start chocolate...it might cause allergies

Please don't: Please don't consider your baby as a little adult, with desires for treats and a sophisticated sense of taste. They have neither, but your actions can hard wire babies brain to crave sweets/ treats which s/he could eventually deal with as a 4-8 year old as obesity.