Dd 2.7 had an accident started peeing in the living room. Dh then picked her up and carried her through the house as she continued peeing. Not her fault at all. I didn't make an issue over it. Was matter of fact about it. I took her pants off and cleaned her up. As I was doing this DD bit me very hard on the arm for a few seconds, long enough to leave a welt. It took me very much by surprise and I smacked her on the thigh. Told her firmly "you do not bite mummy". As soon as I did it I felt awful. She of course was upset, ran back to DH and got a cuddle.
Dh has been quite judgemental about the whole incident. What should I do/have done?