#It came about at the time

This phrase is used here to mark the beginning of a new part of the story. (See: [[:en:ta:vol2:translate:writing_newevent]])

#behold

The word "behold" alerts us to the surprise that Tamar was carrying twins, which was previously unknown.

#It came about as she was giving birth

This phrase "It came about" marks an important event in the story. If your language has a way for doing this, you could consider using it here.

#one put out a hand

"one of the babies put out his hand"

#midwife

See how you translated this in [[:en:bible:notes:gen:35:16|35:17]].

#scarlet thread

"bright red thread"

#on his hand

"around his wrist"