Why does the Torah not write "Va'yimle'u Yamehah Laledes", as it did in Bereishis 25:24, in connection with Rivka?
Rashi: Refer to 25:24:2:1.
Why does it spell "Te'omim" here with an 'Alef', and regarding Rivka (Bereishis 25:24) without an 'Alef'?
Rashi: Refer to 25:24:3:1.
Why does it say "Te'omim b'Vitnah"?
Seforno: Because when they were still in the womb, people (Ha'Emek Davar - the midwife) could tell that they were twins.