if u reset it it will give u an option if u press button b to resume with the tama u had b4 or get a new one and if u choose get a new one then u will ose your tama and baby and all your accomplishments, items, etc.
Don't reset - you will lose all your history, generations (if you have any), etc. I suggest that you just poke a pencil in the button and hold the B button.