# I will raise my hand to the nations; I will raise my signal flag to the peoples
"I will raise my hand and signal with a flag for the people of the nations to come"
# They will bring your sons in their bosoms and carry your daughters on their shoulders
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.
# bosoms
The word "bosom" refers to the chest, shoulders, and arms.