My 2 year old Niece bites. Advice please!?

My 2 year old Niece has been biting other children including small babies. At first it looks like she is going to kiss them but then it turns into a bite and quite hard sometimes. My sister does tell her that its naughty and puts her in her buggy for a few minutes but then lets her out to say sorry. I personally... show more My 2 year old Niece has been biting other children including small babies. At first it looks like she is going to kiss them but then it turns into a bite and quite hard sometimes. My sister does tell her that its naughty and puts her in her buggy for a few minutes but then lets her out to say sorry. I personally dont think she is being firm enough with her as she is at the age where she knows right from wrong. I have a 6 month old and im dreading if she goes to bite her. Any tips/advice would be appreciated, thanks x
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