How do I stop this?

I know there have been threads about biting before, but this is getting out of control! Sienna did this to Mercedes face this morning while I was less than 2 feet away! Poor Mercedes also has a bite on her spine and one on her leg.

I respond to it immediately by picking Sienna up and moving her away and then making a big fuss over Mercedes, but Sienna seems to have no idea, or she just doesn't care, that what she is doing is wrong. She just gets up and continues on with whatever she was doing.

She definitely bites in anger or frustration coz it's always as a response to them fighting over a toy etc. rather than just randomly biting, but I'm at a loss how to stop it. I also don't want Mercedes to develop a "victim" complex where she doesn't stand up for herself.

I'm open to any suggestions! All the research I've read is related to older kids (2+) so I'm wondering if this early biting is a twin thing, and a result of them spending 24-7 together.

PS. I'm not keen on my nana's tried and true suggestion of biting her back

Wow! Sorry no advice but that is a very impressive bite mark.. my goodness...

Oh my,  poor Mercedes!

Oh poor little babe!!!

I read a few articles on biting (though by no means am an expert as I couldn't really do much!) but anyway, for what it's worth this is what I would do - unfortunately it may take a bit of effort.

Shadowing Sienna and watching for triggers, ready to divert when things get close to biting times and/or offering alternative means of settling disputes.

For us it was the communication thing - really working on getting Hannah to use her language instead of biting.

It sort of worked but has only really righted itself now she can talk a lot more.

Good luck!! And be thankful you don't have the guilt of another mother's disgust bearing down upon you!! But poor little Mercedes

At work I find making the biter sit there and watch the other child crying can have a big effect on them. We have a little menace of a bit about the same age and after we have finished growling we make her sit there and watch the other child upset and getting lots of attention, only thing with this is you need two adults, one to help the hurt child and one to growl at the other one..

Oh poor Mercedes that looks nasty!

Sorry no advice but I hope its not a twin thing!!! My two have already started being mean to one another Noah likes to pull Lola's sticky out ears if she is close enough

LOL Toni and you were worried about Miss C being a bully to them - I told you they are far worse to each other!

You should write a book Emma!

"How I survived The Gremlins - and lived to have an Iggle Piggle"

My gosh thats huge! Gotta hurt. Sorry Im not at this stage but will be looking forward to seeing other answers on how to combat this. Mine is the hitting stage at the mo