Two languages!!! 😩

What would you do if you speak a foreign language and your partner speaks English? Well, I speak Spanish  (and English) and my wife speaks English. When and how are we supposed to start teaching our baby both languages? Should we just speak English until she reaches certain age? Should she talk to her in English and me in Spanish? I don't  wanna confuse her but we love for her to speak both languages since it's known that it's harder to learn a new language when kids are older.