Reference for Chullin 149:42

בשלמא לדידי היינו דאיצטריך קרא למעוטי אלא לדידך אמאי איצטריך

[It was taught]: Just as 'the fat and the two kidneys' referred to in the case of the guilt-offering precludes that of a foetus, wherever ['fat' is stated] it precludes that of a foetus.

Jastrow