The Coronation Street star lost the baby boy in 2009 shortly after he was born 18 weeks early.
'I think of Archie every day. I still talk to him to say goodnight or I love you,' she said in an interview with The Mirror.
'We never got to know what kind of a little boy he was or what he would've liked. What colour would his eyes or his hair have been?
'Would he have liked Thomas the Tank Engine, or going on holiday, or which football team?.'
Keen to keep Archie close, the actress also revealed that she decided not to scatter his ashes.
'All I know was that he should have come home with us. So that's what we did', she told the publication.
'We took his ashes home in a tiny box and I keep them next to my bed.'
Archie's father is Kym's ex-husband Jamie Lomas, 42. Together, the soap stars are also parents to a little girl, six-year-old Polly. She was also born prematurely, entering the world 11 days before her due date.
The soap star is also a mum to David, born in 1995, and Emily Cunliffe, whom she welcomed in 1997.
It's not the first time the TV star has opened up about her loss. Back in October last year, Kym shared a very heartfelt post about her grief on Twitter.
'Today is international pregnancy and infant loss day. Today we remember not only our own angel but other people's too. It's still such a taboo subject, baby loss, no one like to talk about it, but you know, it's the only thing that helps you find your way back from the darkness,' the 41-year-old began.
'It's the only thing that help you rebuild your jigsaw, helps you learn to accept what's happened, accept you can't bring your baby back, but learn that you're not alone.
'It's a lonely, lonely place if you're silent. Encourage those who have lost to share, be there to listen and cry with them if you want to. Let's break the silence.'