It's never too late to form an attachment. Ideally you would have bonded from the getgo when he was an infant but he's still very young. If you question how securely he's attached to you, go out of your way to give him extra love and extra affection. Don't waste time questioning whether he's attached or not b/c then you'll be inside your own head and probably won't be focused on HIM. Have fun together, tell him how much you love him, snuggle with him and just give him lots of love and affection. If he's not attached now, he will be.