The Americans star welcomed Sam with his co-star and girlfriend Keri Russell in May (16) and he has been immersing the baby in his native language.

"I am speaking purely Welsh," he told U.S. breakfast show Live! with Kelly on Monday (06Mar17). "His replies you would think he's speaking in Welsh as well. It's quite a guttural language."

Rhys is still adjusting to fatherhood and has been leaning on Russell, who has two older children, as he navigates new territory in their son's life.

"There was a moment recently when he had a very heavy cold and I said, 'We gotta take him to the doctor,' and she's like, 'He has cold, I'm going to get my hair blown out'," he added. "I'm like, 'I'm going to take him to the doctor.' She wen't, 'You take him to the doctor and when the doctor tells you he has a light cold, text me'."