Concerned about your child's speech? Do you worry that they can't say their R sound? Their L sound? I'm hoping that this post will help answer some of those common questions. They vary a little bit based on the research studies that have been done, but here are the general guidelines:
Age 3: all vowels, p, m, n, w, h
Age 4: b, d, g, k, ng, f, y
Age 5: (all above sounds)
Age 6: l
Age 7: r, ch, sh, z, th
You can find many different charts around the wonderful world wide web that show you visually the different ages and sounds to look for. Find some here, here, and here. Or just google "sound acquisition charts" and see what comes up.