The presenter, who gave birth in the morning on 9 September, shared her joy to fans on Twitter.
She wrote: "Jesse and I are over the moon and buzzing with love, as our baby daughter Honey Krissy Wood came into the world this morning."
The presenter was quick to receive hundreds of well-wishes from fans, as well as some famous faces.
@Fearnecotton ❤️❤️ Lovely news Fearne, how exciting 👑 Love to you all xx— Rochelle Humes (@RochelleHumes) September 9, 2015
@Fearnecotton congratulations!!! What lovely news. I bet she's adorable. X— Sophie Ellis-Bextor (@SophieEB) September 9, 2015
The presenter shared the first photo of her daughter the day after announcing the birth with a sweet photo of her tiny hands.
Cotton announced she was pregnant with her and husband Jesse Wood's second child in February, but said she wouldn't be finding out the baby's gender before the birth.
The TV presenter already has a two-year-old son, Rex, who has previously offered his famous mum some baby name suggestions.
In August, Cotton tweeted: "Me - 'what do you want to call the baby when it's born Rex?' Rex - 'Bob the builder baby'."
The 34-year-old left her job at BBC Radio 1 in May and said she was waiting for the next "amazing opportunity to come up".