The agency, which has worked on the main Innocent brand in the past, has been appointed in a strategic and creative role to develop a dedicated kids' to support the launch, along with an advertising campaign.
Fallon will continue to have a project-based relationship with Innocent and did not pitch for this particular work.
Charlotte Rawlins, who takes the title of "town crier" at Albion, said: "Launching the first ever range of truly natural smoothies for kids means we need to communicate to a completely new audience. Albion has a strong grasp of the kids' market and the online space and they've done a great job creating the site."
A campaign has been created by Aaron Hinchion, Matt Harrison, Tim McNaughton and Nick Flugge.
Jason Goodman, managing director at Albion, said: "Marketing to kids with a product as nice as this is as good as it gets."
Innocent recently unveiled its first television advertising, with an ad that attempted to make new smoothie converts, by highlighting the fact its drinks are made of fruit and nothing else.
Other clients of Albion include Virgin.net, Blaupunkt, RNIB, MTV, What on Earth pizzas and the National Gallery.
If you have an opinion on this or any other issue raised on Brand Republic, join the debate in the .