My DS had 0 words and didn't even try to talk or make consistent sounds at 19 months. We did speech therapy from then until age 3 when he "graduated" from the program. He started school at 4 (we have 2 years of kindergarten before grade 1) and barely spoke all that year at school but was fairly average at home. Transitions were always hard for him even as a baby. He was/is a VERY observant kid and likes to observe before doing anything. Intense is one of the top words I'd use to describe him. By Grade 1 he was finally starting to feel comfortable at school and then he wouldn't shut up
We were then told to have him evaluated for ADHD a couple months into grade 1 and he turned out gifted/likely LD (processing speed was really low).
All of his other milestones he met early or on time. He rolled early, crawled at the usual time, walked at 12 months, rode a 2 wheeler at 5, etc. When he was doing ST the therapist commented that he was really smart and his comprehension was advanced. His writing has been slow to develop but seems to finally be clicking (he's now 7). He now has a crazy vocabulary and talks non stop when he has someone who will listen (and he's feeling comfortable). He is still fairly anxious around new people and trying new things but is making improvements there as well.
Best of luck!
