Hi Julie,
When my son was three he had speech problems as well. He was my first so I just figured that was his cute little voice. My nephew who was four asked my one day why his cousin couldn't say his name. My son talked like he had a southern accent. He also couldn't say some sounds, for instance, the letter v. He could point out the letter v to you but couldn't pronounce it. It came out as a b sound or he would refuse to say the word.
I asked my sister-in-law if she thought my son had a problem and she said yes. She didn't know how I felt about it so hadn't said anything. My son's preschool teacher also agreed he needed some help. They were not allowed to say anything unless asked. I felt really clueless as a mother at this point.:(
My son was evaluated and when it was determined he needed speech he attended a speech preschool for a couple hours a week. He loved it. They worked on speech with preschool activities. The kids didn't know they were working on speech.
When kinder rolled around he still needed speech. His speech therapy continued until the middle of second grade. He is now ten and speaks perfectly well.
My son started kinder at four and a half. I was concerned like you about his speech issue and being teased. You will be pleasantly surprised I think. The kids in the classroom never teased him about his voice. (I was in the room atleast once a week helping and had close teacher contact). It was explained to me that generally the kids are envious of those who go to speech or other learning activities because they are doing something special. I didn't really believe it. They also just accepted him for who he was. My son was reluctant to let speech go when it was time.
The only child I have ever witnessed tease my son was a ten year old when mine was six. We were at a party and I saw the whole thing. Luckily, so did this child's father and I do not think he would have teased anyone again after that.
To have your son evaluated, contact your local school district. This will be done at your closest school. It is a free service to you. It is not intimidating. They just ask him questions with you in the room, and they make it fun. The preschool may not be at your closest school but they will try to place him as close as possible to your home school. The preschool is also free.
I cannot say anything but wonderful things about our experience with speech. It was amazing to me how supportive all the kids were of each other. My son is a very self confident and self reliant boy. He truly has no issues that stem from his time in speech.
You are one step a head of me in recognizing that your son may need assistance. The evaluation is the first step and then you go from there.
Good Luck.
C.