I was in the middle of prepping dinner a few days ago and was chatting with ds (2) who was just pottering about in the kitchen and seemed happy enough. Then out of nowhere he came up behind me (didn't notice or hear him coming up) and he bit me hard enough to leave a big black mark right on my bum. He has never, ever done anything like this before and it was completely unexpected and so, so sore (i was only wearing leggings so got the full effect) and I reacted completely on instinct and shouted out loudly and moved my hand quickly to move whatever it was away (initially I thought it was my dog) and accidentally caught him fairly hard in the face in the process. He was distraught and initially I was really cross (and sore) and got down on his level and told him off very firmly before apologising for hitting him and explained that he really hurt me. But now I feel effing awful and I hate that I really scared and upset him, let alone hit him. I have never hit him before and I try very hard not to have big reactions to things around him and don't agree with it as a form of discipline at all, it just caught me so off guard. I feel like an awful parent.