My son is nearly 2.5 and very bright. He may be gifted, but its not clear yet (he's in no type of DC or Pre-school, and I don't push him academically at home). You guys over here seem to be the experts on SPD and I'm thinking my son may be dealing with some sensory issues and I'm not sure how to help him.
The biggest issue is that he scratches his head and back roughly till they bleed. His hair hides the scabs on his head (I thought he had lice, nope. But he does have dry skin, though with the spring coming early here in the PNW its getting much better) and he has open wounds on his back that I need to physically stop him from scratching. He mostly scratches when hes falling asleep, or upset and it seems to be a comforting thing. He reaches back to the "tag" area of his back and scratches very hard. He used to tell me that his shirts were hurting him, or straight out told me to take the tags off, and I always did or helped him find a shirt that felt better. For a while he hated socks, and still sometimes says they hurt, if I'm not sure to keep the seam off his toes (I was the same way as a kid, with the socks).
He can't handle cold, I mean he HATES it when its 40, or if its at all windy. He will beg to go outside then cry because its below 50 (even with a good coat, long pants, etc... Its not like I'm sending him out in shorts in the winter). Though at other times it will be cold and he will refuse a coat and freak out if I even suggest it. Generally he will do that if he's already engaged in something and can' take his attention off it for more than 2 seconds....
He seems to seek lots of touch and stimulation, he begs us to pat his back (sometimes saying to do it hard) and wants to be held a lot (though hes only 2 so some of that is very normal).
He knows several letter sounds, and is starting to read a few words. He will engage in something and stick with it much longer than most kids his age. For example he will do a puzzle, or build train tracks, for a good half hour or more with no involvement from me unless he gets really stuck, then he only wants super minimal help and if I help "too much" he quits the whole project. :/ He gets really into activities and begs to do them constantly, currently its riding his balance bike, thats pretty much all he wants to do, all the time, before that it was trains, and making train tracks. Its this drive/attention span and his ability to learn what he wants so quick that makes me think he may be gifted and I think if he were in a pre-school environment he would have a lot more "knowledge" (like counting higher, reading more, etc...).
Trying to figure out what is normal and what is not, and how to help my son deal with life when he can't. I mostly want him to stop hurting himself by scratching so hard. So maybe this group knows an organic truly tag-less (no print) shirt I could try.
Some addtional info, he has very sensitive skin, can have eczema (but its under control right now), he is allergic to dairy, and sensitive to wheat. He was a very high needs baby who barely slept, and he no longer is nursing, but was BFed till 15 months when he weaned easily.