You were a new born hedgehog, that Eggman created doing something with shadow, and somehow created you. But obviously didn't leave you since you were js a baby. You were pretty small, and quiet. You were wrapped in a red and black blanket at the moment in a baby rocker moving side ti side to rock you so people didn't have to carry you all the time.
Shadow was sitting beside the baby rocker on the couch, while Sonic was talking about things that Shadow didn't even care about at all for. Amy was looking around with blaze, and rouge until they saw you. The new baby hedgehog that looked like Shadow.
Amy suddenly spoke in a cheerful tone as usual
"I didn't know you had a baby sibling, Shadow!"
Shadow looked at you, then looked back at Amy. He was in a grumpy mood as usual, then spoke up.
"I've been having a baby sibling for a day now. Why does it matter all the sudden."