While what you described are some symptoms of autism... they're also totally normal baby behavior. "Toes in the nose" (aka their feet up in their face, and sticking them in their mouth), I have never met a baby that doesn't do it. Ditto arm and hand flapping (they don't have good motor control yet), ESPECIALLY when they're excited. Shaking head, ditto (in fact at 2ish head shaking is almost always present during tantrums... but from neck control through elementary age it also makes them "dizzy" & "blurs the world" which many kids enjoy, not to mention cartoon characters do it when startled or confused, so kids copy it. The sheer number of times I've had to tell kids not to "rattle their brains"... well if I had a nickel for each, I could buy a new laptop.
It's sort of like how a headache can be a symptom of bright light OR a deadly disease.
Mewing at birth (unable to cry as an infant except in cat-like noises), inability to make eye contact, not reacting to external stimuli, ... at 1... those would be symptoms that would worry me. HFA you usually can't determine until quite a bit older... so as an infant you're really looking for something major.
HINT: I've found walking into the doctor's office, blushing, and saying "I'm having a Paranoid Mom Moment... could you let me know about ________? If it's serious, something to keep an eye on, or I'm just being the crazy mom that needs a pat on the shoulder and a chill pill?" has elicited a fantastic response from Peds all over the country. They bend over backwards to reassure me I'm not nuts, listen to me fully, and then do some quick tests. Whereupon I get one of my 3 requests (reassurance, "good catch, lets keep an eye on this, but not worry about it too much now", or the big smile and "He's Fiiiiiiiine. Doing grand." When it's the "Fine" answer I always heave a big sigh of relief (real), and then ask me to show me the difference between what he was doing and what I was freaking over.
In fact, I'll even schedule an appointment as a "Paranoid-Mom well child checkup", which tends to get a laugh from the receptionist. You have to realize, they're people, too. So pick something normal your son does. Anything TOTALLY normal. And they've had a call from a nervous parent in tears or screaming at them like it's a severed artery and their kid is going to die if they aren't seen that SECOND for that very normal behavior (seriously, my girlfriend got a call once from parents who were horrified that their baby was closing her eyes when she slept, and kept waking her up to make sure she was alive, because they couldn't tell for *sure* unless she was awake, and another who called in screaming that her baby was having a stroke... the symptom? Drooling. Seriously. She googled something and found out that stroke patients drool, looked at her drooling infant, and lost it). Dealing with a nervous, but relaxed and aware that they're nervous, parent is a relief.