Steph took to the social media site to announce the birth of her first child on November 8.
She told her 389,000 Twitter followers: “Well hello world, just surfaced to let you know that we now have a daughter! Born on Monday morning just as @BBCBreakfast was wrapping up.”
The presenter added: “We’re all fine and dandy. Just getting used to the eau de sick/poo I am now regularly wearing. #babylife.”
Ahead of her BBC Breakfast appearance today, the TV reporter humorously asked her followers to excuse her dishevelled appearance.
She said: “Please excuse the baby sick I’ll no doubt be wearing somewhere. #parentlife.”
Steph will return to TV screens in the Spring to host her own programme, The Steph Show on Channel 4.