Mila Kunis' daughter thinks everyone has a "baby in their belly".

Mila Kunis

Mila Kunis

The 32-year-old actress is expecting her second child with husband Ashton Kutcher and 21-month-old Wyatt's understanding of the situation has led to some embarrassing moments.

She said: "When you tell a kid that you have a baby in your belly, they think everyone's got a baby in their belly, so my daughter will be like, 'Where's the baby?' and she'll point to her belly, she'll point to your belly, a stranger's belly, so there's a slight problem because she's not quite old enough to understand, so she's like, 'Everybody has a baby in their belly.'"

Mila took some time off after having Wyatt before returning to work on 'Bad Moms'.

And she's thankful she had such a good experience on the set of the film as it taught her that it is important for her to feel "fulfilled" in order to be the best parent she can.

She told 'Extra': "I took a minute off from acting after I had Wyatt, and it was kind of serendipitous that this movie came about... Acting is like 17 hours days, it's not a nine-to-five... Having the script and having the amazing group of women that I worked with, besides my husband who is super supportive, it was the greatest experience that made me realise how important it is to be fulfilled as a human being in order to be fulfilled as a mother."

While she loves being a parent, Mila admits she isn't immune to making mistakes and was once left in tears when she realised she'd forgotten to strap Wyatt into her car seat when they visited Ashton at work.

She said: "I look in my rearview mirror and she's not strapped in... I pulled over and I strapped her in... I got to my husband's work, completely broke down, and started crying."