New and confused

I hope I don’t offend anyone I apologise now if I do.

My partners got 3 children with his ex partner and the 2 eldest have recently been diagnosed with autism. He’s struggling to cope and I have a 17 month old son with him who doesn’t hold his own bottle or talk apart from row row and it might be normal but I’m worried that my son might have autism to I read stuff online and it scares me feel like I can’t talk to anyone. 

His children in order of gender are:

boy- 7

boy-6

girl-3

boy-17 months 

what’s the likelyhood of our son having autism and where do I go from here?

thanks in advance 

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