Going to brag about my kid for a moment, so you've been warned...
Quick background, kid was born 10 weeks early, was 1.5 lbs at birth, spent first 2 months of his life in an incubator in the NICU of a hospital, so very premature, and very small.
We've had quarterly meetings with a hospital-sponsored physical and speech therapist since his birth, they like to closely track the development and growth of preemies, is a program they provide free of charge until not needed, usually between the ages of 2 and 3 when a kid is mostly caught up to where they should be, developmentally.
My kid is ~21 months old, so yesterday we had our last quarterly checkup before he hits the age of 2. He met or exceeded over 50% of the developmental goals that they have for 3 year olds, much less 2 year olds. He already knows about half of the alphabet, can count to 5, and has a vocabulary of 100+ words. They said he was as developed as a typical 2.5 - 3 year old. They told us he's done, doesn't need any more checkups, he's WAY ahead of schedule developmentally for a normal kid, much less a severe preemie.
Very happy, we've been working with him really hard since day 1 on his cognitive skills, and it's damn nice to get feedback from professionals that we're doing a good job(so far).