そのうちインフルエンザの予防注射しないとね。
You need to get a flu shot sometime soon.

予防接種

 去年これやった時、あなた全然、泣かなかったのよ。だから今年も絶対大丈夫。
When you did this last year, you didn't cry at all so I'm sure you'll be OK this year.

予防注射

今日は予防注射を受けるの… ^副作用[アレルギー反応]が出ないといいけど。
She is going to get a vaccination shot today. I hope she doesn't ^get any side effects [have a reaction].

 すぐ終わるからね! アッという間よ。
It's going to be really quick! / It'll be done in no time! It'll be over before you know it.