RCMP say they became involved after the child was brought to a hospital.
Charges of failure to provide the necessities of life and criminal negligence causing bodily harm have been laid against the 23-year-old mother, who was arrested last week.
The suspect's name has not been released due to a publication ban in the case that has been referred to the Children's Ministry.
Police say the child's condition has improved.
Mounties are asking anyone with more information to contact them as they continue their investigation.
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