H.L.
hi L.!!
I was in the same exact situation!!! When we had our 18 month appointment my son only had about 5 words, otherwise he was a perfect little 18 months old, walking, babbling, etc. the doctor referred us to the Regional Center for testing. They are super nice there but after testing him they told me he had severe Autism and had to be in an intense program right away.
I FREAKED out because there was absolutely no sign of anything like that. So i spent about $1000 and went to a well known specialist in Orange County and the specialist told me that he didn't see any signs of Autism in him, there might be some speech delay but nothing more than that. You can't imagine my relief!!!
So my advice is meet with the regional center, but make sure you go at a time when he is well rested and fed, do it when he is in a good mood, becasue the minute he doesn't do what they want him to do like respond to them it seems like its a negative mark.
When i scheduled my appointment with the regional center i didn't know and i thought first available would be good becasue i wanted to know and help my son as quickly as possible, so we went at 5:30 before dinner time at the end of the day and it didn't go well. And they also asked me questions like does he carry things around the house, does he look at ceiling fans, how does he do in new situations...and i didn't know what they were looking for and i answered their questions wrong...i mean which kid doesn't carry cars around with them or trains, but he wasn't obsessed with them, he would leave one and pick up another, he would look at fans but it wasn't think blank look and staring like possessed you know? I didn't know these things...live and learn.
..so with the second opinion we opted out of the intense program and still agreed with the speech therapy they offered, it was free, why not, and he did great within 6 months we were caught up and exceeded expectations and did not qualify any more. oh thats the other thing, your son has to be 30% delayed for him to qualify for the program, FYI.
I hope I didn't freak you out oo much and this helps.
Now he is 2.5 years old and i wish he would be quiet :) So go to the regional center, take their advice and anything they will give you for free but i'd make sure your son is in a good mood when they do the testing, and remember you know your son the best, and take what they say with a grain of salt.
Let me know if you have any questions.
H.