I don't think you know what spiteful means. (I'm not saying that to be mean, just because that word is what got you a lot of negative replies, because it is impossible for a baby to be spiteful) Spiteful means malicious, with nasty or vicious intent. Knowing something will hurt, and doing it deliberately.
A 1 year old can't do that. They can't yet empathise (i.e. put themselves in your place and imagine how it feels for you.) so they can't do something deliberately to hurt you. It's just that when they do hurt you, hour reaction (crying out/jumping/shouting 'No') often seems funny to them, and encourages them to do it again.
My DD is nearly 2 and still does this. She's better at stopping when I tell her than she was, though. I say 'No, don't hurt Mummy' in a very calm, ordinary voice, and remove her hand. though I still squeal when she bites down while falling asleep on the breast, can't help it!
Both my DSs went through this stage too. They're 5 and 3 and don't do it any more, haven't for a long time. Can't remember exactly when it stopped though. You just need to stay calm and consistent and it will pass, honestly!