Is Autism linked to Birth Trauma?

We are still early in the process but believe genetics and our ages were a factor. I had a fairly good pregnancy albeit I was really bad with morning sickness but I was over 20 weeks before I was assigned a midwife as they didn't think I would go to term, I had an easy labour of less than an hour, active of about 3 minutes so was very quick, onlu after he was born did we find out he had a heart conditition and a few days later we found out he has CF (cystic fibrosis), we thought we were lucky as he slept through from about 10days old but now we are being told this could have been the first tell tale signs (he's now 4.5 yrs), he was late walking and still has poor balance when he has a cold and because his speech is poor he has a therapist (when I say his speech is poor I don't mean he can't talk, it is just not as clear as it should be although he has a large vocab and no problem with forming sentences, I have been told many times that he talks like a deaf person in how they form words if you know what I mean). I was 30 when I caught with him and was told then I was an older mum with increased problems but even though I have an autistic cousin I never thought in a million years we were at risk. Truth be told I don't think there is a known cause or trigger, perhaps it just happens.

We are still early in the process but believe genetics and our ages were a factor. I had a fairly good pregnancy albeit I was really bad with morning sickness but I was over 20 weeks before I was assigned a midwife as they didn't think I would go to term, I had an easy labour of less than an hour, active of about 3 minutes so was very quick, onlu after he was born did we find out he had a heart conditition and a few days later we found out he has CF (cystic fibrosis), we thought we were lucky as he slept through from about 10days old but now we are being told this could have been the first tell tale signs (he's now 4.5 yrs), he was late walking and still has poor balance when he has a cold and because his speech is poor he has a therapist (when I say his speech is poor I don't mean he can't talk, it is just not as clear as it should be although he has a large vocab and no problem with forming sentences, I have been told many times that he talks like a deaf person in how they form words if you know what I mean). I was 30 when I caught with him and was told then I was an older mum with increased problems but even though I have an autistic cousin I never thought in a million years we were at risk. Truth be told I don't think there is a known cause or trigger, perhaps it just happens.