The photos were taken in conjunction with Pampers to assist various charity organizations.
"Wanted to give you all a sneak peek of Noah and so thankful to Pampers," the Victoria's Secret model wrote. "By taking these pictures we helped out UNICEF and those in need."
Noah, born on May 8, is the second child for Ambrosio and her fiancé, Jamie Mazur. The couple also has a 3-year-old daughter, Anja.