We are getting a cake on your birthday, not today. Let's say bye bye to the candles.
We are getting a cake on your birthday, not today. (今日じゃなくて誕生日にケーキを買おうね)
Let's say bye bye to the candles.(ろうそくにバイバイ言おうね)
Let's save the candles for your birthday.(誕生日にキャンドルは取っておこう)