This is the approximate ages at which children should have mastered different sounds. Remember that all children develop differently and may not master sounds in this exact order.  There are also other factors that a speech language therapist would consider in determining whether a child’s speech patterns are within normal limits or delayed. E.g. substituting “th” for “s” at age 6 is normal, whereas omitting it entirely or substituting “t” for “s” could be a concern.

Age 3      p,  b, n, h, w

Age 3 ½ t, d, k, g, ng, y

Age 4      f, v

Age 5      l

Age 6      ch, sh, j, th

Age 7      s, z, r, blends