The Hunger Games actress and husband Max Handelman welcomed the baby boy via a gestational surrogate in March 2011.
Banks has previously confessed that she misses her son while working on film and TV projects and now brings him along when possible to locations around the world.
"This job requires you to be a little bit of a gypsy, [and] so far he's totally cool being a little baby gypsy," Banks told People of travelling with the 16-month-old. "We [went] to Paris [for Fashion Week]. He's getting his first passport stamp."
The People Like Us star went on to say that she always considers Felix's needs when deciding which jobs to accept.
"You really have to decide, 'Does that affect my son's quality of life as well as mine?'" Banks explained. "If there's ever a moment where I feel like he needs to be home or he needs a certain something in his life, I'll make a decision based on that."
Earlier this year, Banks revealed that Felix's surrogate is still in their lives.