The actress is due to give birth to her first child in August, meaning that her character Alicia Gallagher will have to take a break from the village.
Alicia's feelings for David Metcalfe (Matthew Wolfenden) are expected to grow over the coming weeks in the build-up to her departure.
Anderson, who is married to partner James Shepherd, told the Daily Star: "We found out a little while ago that we're having a boy, but we haven't come up with any names yet. We want to wait and see what he looks like.
"I've been watching One Born Every Minute. I'm obsessed with it, but it's really starting to freak me out!"
She added: "I'm really pleased with the exit they've come up with in Emmerdale. All I can say is that it involves David."
Anderson joined Emmerdale in summer 2010.