I've yet to discover any developmental delays that I had. I remember reading aloud much more fluently than the other kids when I was about 5, and within a year or so the teachers noticed and got me to read a story to a class (I guess they thought I could do the teacher's job for her). But it came unstuck because they let me pick whatever story I liked, and I just selected one at random. It was a cowboy story and they'd spelled the words in the dialogue to reflect the cowboy way of talking. I could barely read it intelligibly, and they stopped me after a while and abandoned the venture. I was only good at reading proper English.
I could write very neatly when I focussed on it, but sometimes I'd just go too fast and make a mess of it. I had good comprehension skills, my use of grammar and syntax was advanced for my age. I remember having to write a synopsis of a story we'd been told, and glibly dropping in a phrase "the prize will be given by the loser," which they loved because it used the passive voice, which they hadn't taught us yet. They saw me as a bright kid. They made all the others show them a rough draft of their written things and then go back and do it properly when it had been corrected, but they let me just do the first draft because I hardly made any mistakes at all.
I don't know when I started walking, but there's no evidence that it was particularly late.