Sue Radford, 39, and her husband Noel, 43, shared pictures of their latest little joy - baby girl Hallie Alphia Beau - online.
The family, who don't claim any extra state benefits, told how she arrived safely last week weighing 7lb 15oz.
Sue said she was "relieved" Hallie was delivered without any problems after she lost a baby last year.
And the latest addition is already enjoying the support of her large gang of siblings.
"She’s so doted on by all her brothers and sisters and is settling in really well we are so in love with her," wrote Sue in an online blog.
The Radfords run a successful bakery in Morecambe, Lancashire, and raise their huge family without claiming any extra state benefits aside from the regular child benefit.
The pair were childhood sweethearts Sue got pregnant with their first child Chris, 25, at the age of just 14.