baby wont sleep in crib?

Harleigh

sometimes he'll go straight to sleep in his crib and other times, he absolutely refuses. i try to calm him down, but he will scream and scream until he can barely breathe and will not stop unless i pick him up. i can get him to calm down for a moment, but then the screaming continues. he literally ends up hyperventilating from screaming so much. idk what to do. im trying to sleep train, but then he does this and it stresses me out