How do you say Baby i want you so bad in spanish?

Well first you cant really say bad in the middle of the sentence because the literal meaning would be...

"I want you so evil"

Which in my book does not make sense so therefore you would get...

Which still is not what you want to say here. This would inply that I love you inappropriately, or wrongly. A better way is to say "te quiero tan mucho, cariña". Going for literal translations can be troublesome.

or

I want you baby

as for "I love you baby" you would say