Obsessive interests - many will develop an intense or obsessive interest. Interests could be lifelong, or it could be replaced by another one. Some could be encouraged so that, e.g. if there is a love of science then the child may be able to work in a related area when they are older. Special interests could serve several functions, e.g. to overcome anxiety, to provide relaxation, to occupy time, or to help understand the physical world.
Sensory sensitivities - there could be a lack of sensitivity or they could be overly sensitive, and it could occur in any of the 5 senses (sound, touch, smell, taste and sight) and also occur in their balance and sense of where their body is in space and time. Sensory sensitivities can be very complex and overwhelming. Lack of sensitivity could include being unable to feel pain or temperature extremes (e.g. a boiling heater), and some may rock or spin to help with balance and posture or to help them deal with stress. Being overly sensitive could include experiencing feelings of anxiety or pain to certain textures, e.g. the child might want the comfort of hugging, but may experience a fear of being engulfed and losing control. When eating, if food is mixed together on the plate; the various tastes could cause a sensory overload in the child's mouth.