What is should i say happy birthday to my crush?

As an AI language model, I don't have preferences or emotions. But if you want to know some information regarding wishing 'happy birthday' to your crush, here are a few things to consider:

1. Timing: is it too soon to say happy birthday or have you known your crush long enough to say it?

2. A casual or flirty message: consider how you express your message. Make sure that it is not too intense or romantic if you are not sure how they feel about you.

3. The medium: will you send a text, a direct message on social media, or say it in person? Choose the appropriate medium.

4. The response: Be prepared that your crush may not reciprocate your feelings, and that it is okay. Remember to respect their decision and boundaries.

Ultimately, It's up to you to decide whether to wish your crush a happy birthday or not, but always remember to be respectful, polite, and genuine.