For writers of adult fiction, this works well enough no matter how long the author takes (within reason) to write and publish their next book. A gap of a few years might even create greater desire among the fanbase for the next one. But for a children's author, things are rather harder.
Young readers grow up faster than an author can write. So if a children's author has a publishing gap of several years, like my five-year gap between publication of "I am the Great Horse" (2007) and publication of "Sword of Light" (2012), most of those original fans will have grown up and moved on. This means it is surprisingly difficult for a children's author to build a fan base and keep it, unless they write the sort of books that still appeal to their original young fans after they have grown up, i.e. young adult/crossover titles.
Since I am still experimenting with my writing to find my ideal readership, here's a quick review of my published books in suggested reading age order that might help if you are coming to them fresh, or have read some of my older titles and are wondering if you'll enjoy my new one.
very young readers start here...
MAGICAL HORSES (Carlton, out of print.)
An illustrated interactive pop-up book of short stories. I guess you'll outgrow this one at around age 7, unless you're like me and still giggle when you open the cover and a winged Pegasus pops out to say hello! It's got a sparkly cover, so perfect for little girls.
a fantasy book with a real world connection...
SPELLFALL (Chicken House, now an ebook £1-99 / $2-99)
This is a stand-alone thriller that spans two worlds, beginning in a supermarket carpark and ending in Earthaven, a parallel world where unicorns live... yay! Since it's got unicorns in its pages, I'd recommend it for anyone aged 10 or over who likes fantasy. But it's got a real world connection, including alcohol abuse and boy gangs and a kidnapping, so it also appeals to an older readership. Going by past reviews, I don't think you'd be too old for this one at 14 or 15. It's quite a long book at nearly 80,000 words.
award-winning genre fantasy...
THE ECHORIUM SEQUENCE (Chicken House, out of print):
SONG QUEST (Catnip reissue, paperback £6-99), CRYSTAL MASK, DARK QUETZAL.
This fantasy trilogy was originally published on the same shelf as the others, but has been enjoyed by an older readership, average age 14... perhaps not surprising when you consider the original version of "Song Quest" was written for adult fantasy fans, and not too much was taken out to make it suitable for a children's publisher. They are longer books at around 70,000 words each title.
I AM THE GREAT HORSE (Chicken House, out of print, ebook coming soon.)
I hope this helps. Let me know if you would recommend reading these books in a different order... the unicorn is not always right.