Emily Blunt's stutter came back when she was pregnant.
The 32-year-old actress - who has 20-month-old daughter Hazel with husband John Krasinski - began acting as a child as a way of overcoming her speech difficulties and though she eventually "grew out of" the impediment, she was surprised when it suddenly returned.
She said: "I've sort of grown out of it, but funnily enough when I was pregnant it came back quite prominently. That was interesting."
The 'Sicario' actress admits motherhood has changed her profoundly and she loves the feeling of having a constant "lovely distraction" in her life.
She told Radio Times: "It changes you infinitely in a rather overwhelming way.
"The best way I can describe it is that it's like this lovely distraction that I always have. It's always there and I love that feeling."
The British actress currently lives in Los Angeles with her family, but has mixed feelings about the city.
She said: "It's complicated. I love so much about LA and I hate a lot about it too.
"I hate that it's a one-industry town and that the quest for success emanates from every corner of it. It can be suffocating in some ways.
"But I love my friends there, I love the weather and it's a very easy place to raise a child.
"A lot of time we lie outside of LA in the countryside, in a place called Ojai, which is lovely and offers more respite than the city."