(R. Ba citing R. Yirmeyah citing Rav): Rebbi holds that the entire face must resemble a man. Chachamim hold, even one of the Simanim. R. Shimon ben Yochai holds, even his fingernails [suffice].

Question (R. Pinchas): R. Shimon ben Yochai contradicts himself! There, he says that [one may eat the child of a cow] only if Rosho and Rubo resemble its mother, and here he says so (even his fingernails suffice)?!

Answer: Here he discusses a person. There he discusses an animal.

(R. Ba): R. Chiyah Rubah went to the south. R. Chama the father of R. Hoshayah, and Bar Kapara, asked him, if it is entirely human, just its face is of an animal, what is the law?

R. Chiyah went and asked Rebbi. He told him, go write for them 'it is not a child.' (ALEI TAMAR - he told him to write outside the Beis Midrash, for oral Torah should not be written. However, one may write a Chidush that is prone to be forgotten - see Rashi Shabbos 6b DH Megilas.)

(R. Yirmeyah): Zuga (a Chacham) went outside. R. Chama the father of R. Hoshayah, and Bar Kapara, asked him, if both of its eyes are flat (the form is not recognized), what is the law?

[Zuga] went and asked Rebbi. He told him, go write for them 'it is not a child.'

(R. Yosi bei R. Bun): Rebbi said like his opinion. Rebbi holds that [it is a child] only if the entire face resembles a man.

Question: If the face is mashed (and the form is recognized slightly), what is the law?

Answer (R. Yosa): R. Yochanan and Reish Lakish argue about this. R. Yochanan says that it is not a child, and Reish Lakish says that it is a child.

(R. Ze'ira): R. Yochanan did not say that it is not a child at all. Rather, it is not a child for his mother to have Yemei Tohar, but it is a child for her to have Yemei [Tum'as] Leidah.

(R. Yochanan citing R. Yanai): If its thigh is Atum (missing, i.e. no leg branches off from the torso), it is not a child.

(R. Yochanan citing R. Yosi bei R. Yehoshua): If its navel is Atum, it is not a child.

(R. Yochanan citing R. Zakai): If its Nekavav (through which one urinates and excretes) are Atum, it is not a child.

(R. Ze'ira citing Gidul): If its skull is Atum, it is not a child.