Baby Hanson was born by caesarean section weighing 8lbs 9oz on June 3, just weeks before Fletcher's milestone birthday on July 8.
The Liverpudlian star told Hello! magazine: "Hanson is the best birthday present I could wish for."
She added: "I have my two kids, a lovely husband and we are all healthy."
In 2015, Fletcher suffered an ectopic pregnancy which is why Hanson's safe arrival is all the more special.
"Having the ectopic pregnancy last year was sad and scary," she said.
"It made me really negative and doubt that it would ever happen. I wondered whether things were not working properly because I was older.
http://www.bournemouthecho.co.uk/uk_nat ... 0/?ref=rssAww Congrats Alex