Turn a baby into a lady,
In continuation of the above line, he is saying that you are not a woman until you have a child. So once he puts a baby inside her, she progresses from a baby(kid) to a lady(woman).
Let’s just hope she’s 18!
To help improve the meaning of these lyrics, visit "PMW (All I Really Need)" by A$AP Rocky (Ft. Schoolboy Q) Lyrics and leave a comment on the lyrics box