The characteristics of autism vary from person to person so you should seek professional guidance if you notice something isn't right with your child.
local offer logo If you’re worried about your child’s progress in school or their development in early years, speak to:

They'll be able to discuss your concerns about your child and offer advice and support, and they may be able to refer them for further help or an assessment.

It could be useful to keep a behaviour diary leading up to any discussions about your concerns regarding your child and maybe useful if you are referred.