Yahweh continues speaking to Zion as if it were a woman. He explains how she is able to have so many children. (See: [[rc://en/ta/man/translate/figs-personification]])
These two clauses mean basically the same thing. AT: "I will raise my hand and signal with a flag for the people of the nations to come" (See: [[rc://en/ta/man/translate/figs-parallelism]])
Yahweh speaks of the people who will inhabit Jerusalem as if they were the city's children. He also speaks of the people of other nations helping the Israelites to return to Jerusalem as if they were carrying the Israelites. (See: [[rc://en/ta/man/translate/figs-metaphor]])