Having a baby is never easy, under the best circumstances. My first was born four months early and is multiply handicapped but not Autistic. My second was developing normally until 15 months when I realized all was not right. He was diagnosed with Autism at three.
I just had my third son and can't stop thinking/worrying about the chances of him having Autism. He isn't the easiest baby, which just strokes my fears. He is five weeks old and isn't making great eye contact. He makes it but only some of the time. He has smiled a couple of times, never for me though and I can't be 100% certain that it wasn't gas. He wants to be held most of the time (he will sit for short periods and that has gotten better since birth). He arches his back sometimes. He prefers to be held during sleep (he does nap during the day on his own).
He does have reflux which he struggles with (which could explain the arching and fussiness). He was also born three weeks early and just didn't seem "cooked" (I had a lung maturity test with him, passing was 2.4 and he was 2.7)
How do I relax? How do I enjoy his babyhood? How can I assume that there is a possibility that he does NOT have Autism?
Thanks for any words of encouragement.
I understand why you're scared, and I don't blame you!

I can also relate. I have a 3.5 asd who was 2 when my twins were born. He was newly diagnosed and i was learning all about autism.
After that I kept waiting for the bomb to drop and it did. One was not self feeding cherrios at 8 months so i had him evaluated by EI. HE was delayed across the board, especially with play skills and found eligible. We started services and four months later he was discharged because he caught up. Had i not been exposed to the symptoms, i would have missed it and he probably would have had more delays. He is now a typical developing child.
At least as an experienced mom you know what to look for and can have intervention started as soon as you see symptoms, if you see any at all.
He does have some speech delays and our dev ped said it is because he sees his older autistic brother and that is what he is imitating since he doesnt have the typical speech. keep that in mind as they get older. Make sure you bring the youngest child around typically developing peers so that he can model them as well as your older children.
I also understand as you can see I have boys that are ASD and am waiting to give birth now. BUT you can't do1 thing about it ifit is it is if it isn't it isn't the only thing is you may notice things faster. I would just love your little boy just for being your little boy NT or notI have been doing the same thing from the time my daughter was born and I dont know when i will be rest assured she is NT,cause u always seem to worry. Well she will be 2yrs this week and met all her milstones and talks like a song bird and is very smart. I also has choosen not to immunize her,well she has only gotten 3shots so far so she is way behind but i am taking it slow,this is still a concern for me but so far so good.right now my only concern is that my daughter models my sons behaviors too much, I am afraid of one day it will be too confussing for both of us and possible misdiagnosis cause of this. others things she will grow out of it when she start school and is around NT kids more.
Also my son did regress around 15mths and she is pass that but I have a fear it could happen latter. but believe me i know how u feel, I just dont know how or when you will be at ease.as you can tell I am still not at ease just not as worried as i used to be in her baby years.
I also understand what you're going through. I am still watching my 21/2 yr old since my first son is on the spectrum. (PDD-NOS)
I wouldn't worry so much this early though. I don't think 5 week olds make much eye contact yet. I also don't think they really interact until about 4 months old. I have my second son in EI services since he was speech delayed. He is 2 1/2 now and is talking quite a bit. He is very social but has some behaviors that are kind of suspicious. (hand flapping and jumping up and down) It's hard to tell if some of this isn't learned from my first son though. I have also talked to a lot of parents that noticed just a few of the traits in siblings (probably not enough to be diagnosed with anything -just enough to make you wonder) It doesn't hurt to keep an eye out but don't miss out on the joy of your baby.
Take care,
Laurie
beleive me i know how you feel my second is 8 months old and im constantly watching for every little thing, like he loves to rock he rocks all the time and he will roll back and forth on the floor just seems to love it. I know the chance is there but right now there is nothing that can be done so i observe and try not to jump on anything. I am expecting our third in may and I know its going to start all over again, but no matter what im ready.