My youngest DS is 4 in March. He is a very bright boy, his comprehension and language is well above where he should be.
His speech is clear and he is understandable but he cannot pronounce his 'Ls'. Well in particular Cl or Fl etc, he can say words that start with L fine but l's in a word he struggles with.
He will say 'chose' instead of close or frag instead of flag.
I know there are some letters/sounds that are common for kids to take a while to get the hang of, is this one of them? When do you start to worry about it?