What are the signs of mild autism in a child?

I used to bite my fingers and hands to self regulate. I sucked my thumb sometimes too.

I wasn't unable to get non verbal communication and non literal communication too.

I was very obsessed with angry birds, I played angry birds, I had ab toys, I watched ab in TV and I was so obsessed with that.

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I interacted with older or younger children and if I didn't have that chance I talked to some teachers.

I made too much eye contact, I just stared at people's eyes for very prolonged times often causing discomfort.

These are my resumed signs of autism when I was a child. Most of them got overlooked because the only thing about autism my parents and grandparents knew was about very severe cases of autism. Another factor is that I was born female (I'm trans) and that I masked from a young age.

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I was a calm baby, I didn't cry that much and I didn't need another person's entertainment.

I had trouble to be fed. I ate slower and it was difficult for me to stop drinking from the bottle or breast. I also had trouble eating solid food.

I had trouble answering questions about topics that didn't interest me or I just didn't answer.

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I always had a justice sense, if there was no equality or justice I would get very upset about that.

SIGNS I HAD AS A BABY (0–2 YEARS)

I didn't have a social smile and I sometimes had exagerated facial expresions or just expressionless.

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I woke up and threw all my toys away from my crib and start crying.

I learned many skills like reading and writing earlier than other children.

I didn't pretend play like the other children. I didn't know how to do that specially with other children.

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My reaction with other children apart from my close family approached me was mostly walking away or hitting them.

I also didn't group play, I was physically close to those children but I was parallel playing most of the time.

I loved to run from one side to another side and jump a lot, I always did it everyday.

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I had problems to follow instructions and to follow rules, I always got in trouble for this one.

I will answer this question showing my signs of autism I had as a child:

Anything could make me laugh to the point of annoying other people.

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I had trouble sharing objects and food, normally someone had to tell me to give them something. I sometimes didn't want people to have my objects to the point of meltdowns.

I was under sensitive to bowel and bladder feelings but other Interoceptive feelings felt just too much.

I had limited interest in another children, I normally played just with my brother but no other children. I occasionally played with my cousins.

Why do some people refuse to explain their actions or behavior when asked? Why do they claim to not know the reason instead of providing an explanation?

I copied people from TV shows or films, their way of walk, talk and personality.

I loved to stay alone in my room drawing or playing with my legos, I could do that for hours.

I used to hit my siblings very often, that was my way of playing with them.

Why can't my adopted sister accept she is not part of my family because she isn't related? Why can't she stop calling my parents mum and dad?

SIGNS I HAD AS A CHILD (3–12 YEARS)

I didn't know why people felt happy or sad in determined situations.

I had a fantasy world, I was always there and that was the best place to be, when I was anxious I went there and zone out.

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I watched some films over and over again specially my favourite scenes.

It was very difficult for me to get social cues so I had inappropriate responses many times.

I was over or under sensitive to most sensory input causing sensory seeking oravoiding reactions.