Katherine Heigl found it "tough" being away from her three-month-old son for the first time

She said: "This is the first time that I have left him. He's just a little over three months now and I'm just here for one day and I thought, 'You know, it's irresponsible of me to, like, disrupt his whole schedule for one day just because I have an issue.'

"He's totally fine without me and I have a problem, so I'm trying to be the grown up here and make the right decision on his behalf. Oh, I'm sure [I'm having a tougher time than he is]. I already Facetimed him from the airport."

And the 38-year-old actress is missing her two daughters - Nancy, eight, and four-year-old Adalaide - too.

She added to Entertainment Tonight: "I should have moved things along because I was late and I needed to get going to make sure I got my flight this morning, but my middle [child], who used to be my baby, gave me this rare like snuggle session this morning.

"She's not much of a snuggler, like, she's more of a daddy's girl, and she'll come to me for a kiss or two, but never really snuggle snuggles. So I got that this morning too, so now I'm feeling especially sad and missing my babies."

And Katherine is desperate to have more children.

She shared previously: "I still want more children. I'd get pregnant again, and I still am very inspired by adoption. I also have been thinking a lot about fostering."