From the back of the book:
Jake's wife, Elise, wants a baby more than anything. Then Jake discovers that a brief liaison more than three years ago, before he even met Elise, had an unexpected consequence: a child who's now been abandoned by his birth mother. Ben needs a home and he's not just any little boy. He has some special needs and requires extra attention.

Jake knows he can be a father to his son but can Elise become this little boy's mother? She'd hoped to be pregnant by Christmas. Can she accept another woman's child instead?

Left at the book exchange outside Liquorland and Coles on level 3.

Release #8 for the 2018 Christmas Challenge.
Release #15 for the 2018 What's in a Name? Challenge.