Even though biting is an upsetting habit for parents, even more - so if they are biting other children, this behaviour is really very normal in lots of children. There are a number of reasons why they tend to do this. At around the age of your sons, and even a little earlier, as you will know, they start putting absolutely everything in their mouths. This is really just one of the ways babies explore and learn about the world –how things feel and taste, and they are very likely to start biting at this stage.
Then there is teething, when again they are very likely to bite almost anything. This can be to ease uncomfortable gums. By the time they are the age of your twins, or a little older, possibly closer to one year, they might be doing it to get a reaction. If in the past you have reacted very strongly to the biting, they can do it again to get a similar reaction. This may seem odd but from a baby’s point of view, it gives them a little bit of power and excitement! The trick is to try and behave as calmly as possible, not shouting or over-reacting when they do try to bite. You are doing absolutely the right thing by gently stopping them, but you might need to make your tone a little bit firmer so they are left in no doubt that you do not see this as a joke and are taking it seriously. When it does happen, get down to their level, make eye contact, and say in a very firm voice “We don’t bite. That hurts, and you don’t bite mummy.” Then ignore their protests for 30 seconds or so, possibly turning away so you are not giving any attention. You may have to do this quite a few times before they get the message. Prevention is always better than cure so have a look at the situations where it is happening and change things so that the biting is less likely. Move away if they are coming towards you, or hold your hand well away from his mouth so he can’t reach for example. Some people advocate biting a child back to show it hurts. This is never a good idea.

hya, i have 9mth old twin boys. they have recently both started biting me and their dad or whoever picks hem up really. they will also crawl over and bite me if i am doing something, whenever i tell them no and that it is naughty they just laugh and do it again. does anyone have any ideas of how to stop this as its a habit i dont want them getting into and end up biting each other also fed up of havin teeth marks and scabs from where they draw blood. thank you xx