‘And Leah conceived again and bore a sixth son to Jacob. And Leah said, “God has endowed me with a good dowry. Now will my husband dwell (zabal) with me because I have borne him six sons.” And she called his name Zebulun. And afterwards she bore a daughter and called her name Dinah.'
Now that Jacob realises that she can still be fruitful he lies with Leah again and she produces a sixth son. She clearly conceives easily.
“God has endowed me with a good dowry.” The suggestion has been that the wives brought little dowry with them. But now she feels God has made amends for this by giving her six sons, twice the perfect three. She has brought Jacob better than wealth.
“Now will my husband dwell (zabal) with me.” It seems that the bearing of further sons has established her status. She is no longer put to one side, but receives the honour due as a wife. The word zabal connects with a similar word used in Assyrian marriage law.
The mention of Dinah so abruptly is noteworthy. It prepares the way for the later event (Genesis 34). But it may arise from the fact that she grew to be famous as an outstanding personality or beauty. Everyone knew about Dinah! Or the reference may stress that Jacob is a bearer of sons, with Dinah the exception, stressing his masculinity.
But more likely is that Dinah is mentioned to make the number of Jacob's children up to twelve (see below). Twelve is seen as the full complement of tribal rulership.