Ok.... So my DS - 5 in October has trouble changes sounds like this. I've copies this from the speachies list of observations.

K to t - eg book to boot
G as d - ef girl as dirl
Sh as s - eg fish is fis
Ch as t - eg chair is tair
J as d - eg jumper is dumper
R as w - eg red is wed
Th as f - eg feather as feafer

K and g can develop up to 4 years of age. DS has JUST started doing it correctly.... Right after the appt!

The sounds 'sh', 'ch' and 'j' typically develop up to 6 years of age. The sounds 'r' and 'w' can develop up to 7 years of age, so for DS he was fairly typical, even though I was worried!

I'll bbl with more!