The Crown Prosecution Service is reviewing its file on the death of Poppi Worthington following the findings of a High Court family judge who ruled the girl's father had sexually assaulted her shortly before her collapse.
The CPS previously decided there was "insufficient evidence to provide a realistic prospect of conviction" but has confirmed it is now "reviewing the case".
On Tuesday, High Court family judge Mr Justice Peter Jackson found Cumbria Police conducted no "real" investigation for nine months into the death of the toddler, who collapsed with serious injuries at her home in Barrow-in-Furness in December 2012.
The judge also ruled Poppi's father Paul Worthington had sexually assaulted her shortly before her collapse.
A CPS spokeswoman said: "We received a file from Cumbria Police, in relation to the tragic death of a 13-month-old girl in December 2012.
"We conducted a thorough review of the evidence in accordance with the Code for Crown Prosecutors. This review included consideration of expert evidence which was carefully considered by the prosecutor who took advice from experienced counsel.
"We decided there was insufficient evidence to provide a realistic prospect of conviction and therefore no one was charged with any offences relating to her death.
"Following the findings of the Family Court judge we are now reviewing the case."