Formal:
* Magandang araw po, Baby. (Good day, Baby. - Used for addressing a baby politely)
Informal:
* Hello Baby. (This is directly translated from English and is commonly used)
* Kamusta Baby. (How are you, Baby? - A more casual greeting)
* Hi Baby. (This is also commonly used)
Affectionate:
* Mahal ko, Baby. (My love, Baby. - Used for expressing affection to a baby)
* Ang cute mo, Baby. (You're so cute, Baby. - Used for expressing affection to a baby)
Remember that the best way to say "Hello Baby" in Tagalog depends on the specific situation and your relationship with the baby.