Definition: In this task, you need to reverse all words of a given length in the sentence. The number of letters in a word determine its length. For example, the length of the word "apple" is 5.
Input: Sentence: 'the  baby girl is in her home celebrating her first birthday with birthday cake'. Reverse all words of length '5' in the given sentence.

the baby girl is in her home celebrating her tsrif birthday with birthday cake