I know, right?
For those nights that I was havin them seizures
For those mornings that I was havin trouble breathin
C'mon listen; I was only a fo'-pound baby
So I grew up into grown and went fo'-pound crazy

from Slaughterhouse – Pray (It's a Shame) Lyrics on Rap Genius

Meaning

Complications from a premature birth. He was a 4 pound baby so that why he love the 4 pound meaning guns.

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