primero haizi animal        

What animal is a "Primero Haizi"

is not a standard, recognized phrase in either Spanish or Chinese. It appears to be a combination of words from two different languages.

Here is the breakdown of the likely intended meaning:

Part of the Phrase Language Meaning
Primero Spanish First (or foremost, leader, best)
Haizi (海子) Chinese

The pen name of the famous modern Chinese poet Zha Haisheng (1964–1989.

The characters in his pen name are different from the common word for "child":

  • 海 (Hǎi) means "Sea" or "Ocean".

  • 子 (Zi) means "Son" or "Child" (often used as a diminutive suffix).

What this likely means when your son is telling you that he is getting a pet(animal) primero haizi he is really saying he his having his first child.

primero(first) haizi (child)