By two years of age, a child should correctly produce h and m.

By three years of age, a child should correctly produce b, g, k, n, p, t, w.

By four years of age, a child should correctly produce d, f, kw.

By five years of age, a child should correctly produce bl, ch, j, l ng, r (final r), s, sh, y.

By six years of age, a child should correctly produce br, dr, fl, gl, gr, kl, kr, pl, r (initial), r (medial), st, tr, v.

By seven years of age, a child should correctly produce sl, sp, sw, th (voiced), z.

By eight years of age, a child should correctly produce all of their sounds including th (unvoiced)