As was said, autism is a spectrum- I have four girls and at least three of them are on the spectrum and they are all different. On the Autism Speaks website they have lots of videos on normal vs autistic behavior. I watched all of them a few months ago and my children, although very different from each other, are much more like the autistic children in those videos then the 'neuro-typical' children.
My oldest seemed autistic from birth- she cried all the time, had trouble sleeping, had to be held upright with her head overlooking my shoulder or to sleep chest to chest/upright. If not like this she screamed. She wouldn't let me eat or do anything but bounce around holding her just so. While in stores she screamed the whole time. She was terrified during baths until age three. These are all symptoms of sensory problems but I didn't know that. Also, her motor skills were delayed and she didn't make eye contact or smile at me. I had to teach her eye contact and smiling. She was rolling early, though. As a newborn she rolled over the pillows and off the sofa! I was quite terribly shocked. Also, when she was born she was in the NICU and although she was only 4 lbs they had to tie her down because she would scoot and roll all over the issolette- none of the other babies were tied down. they said she was a 'feisty' one.
When she was a toddler when we left the store she would throw herself onto the parking lot asphalt and bang her head repeatedly on the ground. At home she would bang her head on the window.
She had advanced speech rather then a delay. She preferred to play with mechanical toys. She gets frustrated easily and has huge meltdowns (used to last for hours but now only 5 minutes or so since being on the gluten-free diet.) She has to know exactly what is going to happen at all times and if it doesn't happen she melts down. She requires LOTS of interaction and a lot of physical touch as she is a combination hyper/hypo sensitive. sensory therapy has helped her but hasn't made her SID go away.
My second daughter was wonderful- she slept well and seemed to have no autistic symptoms at all until age 13 months, when she stopped talking. She started spending lots of time in her crib- about 20 hours or so. She refused to spend time with us, she didn't make eye contact, she was not affectionate or relational. It was like our sweet little interactive toddler was suddenly placed in a bubble and we could see her but couldn't reach her. She didn't have meltdowns like her sister, though.
My third daughter had trouble sleeping during the day- only one nap from birth, not the normal sleepy newborn. She hated baths until recently (almost three.) But other then that she was fine until age 14-16 months somewhere in there. She was an early talker but suddenly I couldn't understand what she was saying. She went from speaking in 3-4 word phrases to just gibberish. She lost eye contact and was also not affectionate. I had her hearing tested and it was fine. She started covering her ears when a car went by or for other 'loud' noises. she started having huge meltdowns or would totally withdrawal and was hard to 'reach' when she was overstimulated or upset. She is getting better with sensory therapy and the GF diet but I think she would improve more with a dairy/CF diet as well.
My fourth daughter (12 months this coming Sunday) has always been interactive- something many drs would consider to be not on the spectrum but for autistics like my oldest, it is normal. The nurses in the hospital were amazed that she seemed to take everything in, would REACTIONARY smile, would push herself up and look around, could roll to her side. Like my third child, she would only nap once a day, rather then sleep all the time like most newborns. She cries with loud noises and hates bathing. I have to fight with her in the bath. She started talking at six months and is already using phrases like 'I did it' and 'kitty cat' and 'mommy more juice.'She has huge tantrums if things don't go her way. She tries to do activities that are too old for her (like read a grown up book or put together an older child's puzzle) and meltsdown because she can't accomplish it. she won't let me take it away, though, because she fixates on doing it and won't accept something else to play with.
She has excema which has gotten a lot better since I stopped drinking milk (I breastfeed) and stopped giving her milk in a cup.
Please feel free to PM if you like.
S.