lostonearth35 wrote:
Having three other siblings when you're on the spectrum is hard enough, but when one of them is a baby it can bring on all kinds of sensory issues. Babies tend to look really homely when they are born, they almost don't look human at all, when can be creepy or scary to a kid, even though they usually get cuter as they grow. And then there's all the odors: dirty diapers, baby powder, baby barf, lovely. Babies can be unpredictable with their sounds and movements. When I was a kid I couldn't watch them eat baby food because it would make me gag.
I think this is absolutely what is happening. And it is not just with autism. It happened with my ADHD son, and I believe it can happen with simply sensitive people as well.
Humans are meant to have alert triggers to respond to babies' needs. It seems to be tuned too finely in some people and they are overwhelmed by it to the point that it is like being burned by a hot stove. They will run away from or lash out at a crying or messy baby before their conscious brain has time to think about it.
I believe you should try to keep your kid away from the baby in all but optimal situations and then try to increase tolerance slowly. Try to get the negative associations to an absolute minimum. The relationship will build naturally when the baby is older.