An Ambridge woman accused of trying to kill her baby pleaded guilty today to a charge of aggravated assault. 21-year-old Kayla Hummel was sentenced to 4 1/2 to 10 years in prison. Hummel was charged with attempted homicide in October. Doctors said her 3-month old baby suffered fractured ribs, a fractured skull and bleeding on the brain. Hummel cried today in court. The child has been staying with family members.