A man who climbed through a window to abduct a three-year-old girl from her Childers home, south-west of Bundaberg, has won an appeal against his sentence.

Eden James Kane snatched the child [identified by the pseudonym "Jane"] while she was sleeping in April 2014, and kept her at his house for two days.

Her disappearance sparked a state-wide child abduction alert before she was found wandering alone at the local showground in the middle of the night.

Kane was sentenced in April to four-and-a-half years in jail and was eligible for parole in August due to time already served.

In the Brisbane Court of Appeal this morning, his appeal of the sentence length was successful and he will be released on parole today.

Kane's lawyers successfully argued the sentence was excessive and the judge erred when finding the little girl was "terrified" during her ordeal when the evidence pointed to the contrary.

"There is no direct evidence that Jane was terrified," the Appeal Court judges said in their decision.

But they agreed that the experience was a frightening ordeal.

"The agreed facts included that this little girl still suffers from nightmares and that she will not sleep in her bed as she is frightened."

Police and the SES searched Childers for the missing 3-year-old. ( ABC News: Frances Adcock )

It was also successfully argued that it was inappropriate for the sentencing judge to express the importance of a deterrent when Kane had successfully sought ongoing treatment for his bipolar disorder.

Kane pleaded guilty to five charges including one count of child stealing and one count of burglary — and it was those two charges that were successfully appealed.

His original four-and-a-half year sentence will be reduced to three years.

Kane served a total of 417 days in pre-sentence custody between April 15, 2014 and June 5, 2015.

He will need to adhere to strict parole conditions and will breach the order if he commits another offence.