This year, in hopes of being prepared for the birthdays that always seem to sneak up on me, I bought books for all my reading nieces and nephews in one fowl swoop (we already had something for the littlest one, who happens to have one of the earliest birthdays). Since I'm certain that none of them read this blog I'm going to share my selections here.
From the Mixed-up Files of Mrs. Basil E. Frankweiler by E.L. Konigsburg (for boy turning 11)

From the Mixed-up Files of Mrs. Basil E. Frankweiler was one of my favorite books. I loved the idea of running away to the the Metropolitan museum of art (and of sleeping in a famous, ornate bed).
Mrs. Frisby and the Rats of NIMH by Robert C. O'Brien (for girl turning 10)

Another book I loved as a child (I loved the film adaptation, The Secret of NIMH as well; I remember reading Rasco and the Rats of NIMH, but not the second follow up).
The Mysterious Howling by Maryrose Wood (for girl turning 12)

Found running wild in the forest of Ashton Place, the Incorrigibles are no ordinary children: Alexander, age ten or thereabouts, keeps his siblings in line with gentle nips; Cassiopeia, perhaps four or five, has a bark that is (usually) worse than her bite; and Beowulf, age somewhere-in-the-middle, is alarmingly adept at chasing squirrels.
Luckily, Miss Penelope Lumley is no ordinary governess. Only fifteen years old and a recent graduate of the Swanburne Academy for Poor Bright Females, Penelope embraces the challenge of her new position. Though she is eager to instruct the children in Latin verbs and the proper use of globes, first she must help them overcome their canine tendencies.
But mysteries abound at Ashton Place: Who are these three wild creatures, and how did they come to live in the vast forests of the estate? Why does Old Timothy, the coachman, lurk around every corner? Will Penelope be able to teach the Incorrigibles table manners and socially useful phrases in time for Lady Constance's holiday ball? And what on earth is a schottische?
I haven't read this one, but I loved the concept (children raised by wolves and whatnot) and it seems endearingly cheeky. I also like giving first-in-a-series books because if the recipient enjoys it they can continue along with the series.
The child in question has already received this book, but I haven't had word on what she thought of it, if she's even read it yet.
The Sigh by Marjane Satrapi (for girl turning 8)

I wasn't familiar with The Sigh before I happened across it on a table in the children's section of the Strand. I do like Marjane Satrapi. The Sigh is more illustrated book than graphic novel and it is suitable for all ages (per the cover at least, I flipped through and didn't see anything questionable).