In the 1937 edition of The Hobbit, this word phrase does not appear.
In the OED, it has a compound word entry “birthday present” with an example of “birth-day present”, but in no case hyphenated as JRRT uses it here.
- 05.085 My birthday-present!’
- 05.087 My birthday-present!
- 05.109 My birthday-present.’
- 05.111 My birthday-present!
“birthday, n.” OED Online. Oxford University Press, June 2017. Web. 5 September 2017.
words that you were saying 
[…] This common word shows up only once, less often than “Birthday-present“. […]
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