Minding Frankie / by Maeve Binchy.

Enhanced descriptions from Syndetics:

A New York Times Bestseller -- When Noel learns that his terminally ill former flame is pregnant with his child, he agrees to take guardianship of the baby girl once she's born. But as a single father battling demons of his own, Noel can't do it alone.Fortunately, he has a competent, caring network of friends, family and neighbors: Lisa, his unlucky-in-love classmate, who moves in with him to help him care for little Frankie around the clock; his American cousin, Emily, always there with a pep talk; the newly retired Dr. Hat, with more time on his hands than he knows what to do with; Dr. Declan and Fiona and their baby son, Frankie's first friend; and many eager babysitters, including old friends Signora and Aidan and Frankie's doting grandparents, Josie and Charles.But not everyone is pleased with the unconventional arrangement, especially a nosy social worker, Moira, who is convinced that Frankie would be better off in a foster home. Now it's up to Noel to persuade her that everyone in town has something special to offer when it comes to minding Frankie.