Hello, M.! First of all, congratulations on your homeschooling endeavor! I too am a homeschooling mom and I love to hear from other moms! Kudos to you!!! Okay, my youngest has a similar problem. He is now 5 but still many cannot understand him. I believe that living in the south is sometimes harder for kids because of those southern drawls! LOL!! I have talked with the pediatrician for many years and he is keeping tabs on his speech progression and at his 5 year old check up, the doctor commented that his speech has dramatically improved over the last year!! Yeah! Speak with your pediatrician and see what they say. It could just be that they need to develop those certain sounds.
Yes, you can get a speech evaluation through your local public school system. They can get you the help you need if there is a problem that your pediatrician diagnosed.
Also, for the poster who thinks we have little hobbles and keep our children to ourselves! Get your information and facts before you make such ignorant comments! I have been homeschoolling for 7 years. My children are very active and participate in what I think is too many things, but they get the interaction that they need. If your child is 10 and still can't speak right, then there is a major problem, but I believe that in preschoolers that is very common. Not every preschooler goes to a preschool nor do their parents send them to day care! There are parents who prefer to parent their children and not send them off every minute they get the chance.
Good Luck, M.!