
Hi Partos
as this is a cross between two different breeds rather than a breed in its own right it's anyone's guess what size your girl will finish. Anything between the size of the smallest cocker to the largest springer :)
I've never had a breed nor known of one to be anything like full size at the stage of teeth changing - that happens at around 4/5 months of age on average and any breeds, cross breeds and mongrels I've known over the years have not been fully grown at that stage.
Most medium size dogs, regardless of their origins, continue to fill out, body up and mature until around 2+ years - nowt to do with
height as growth spurts can come and go without rhyme or apparent reason over differing periods be that months or, with one of mine, until almost 2 years.
I'm sure you'll love your girl whether an itsy bitsy or otherwise.
regards, Teri