Developmental category

According to Kelby’s mom, Kelby has always been a “late bloomer.” She is almost 2 years old and cannot walk, doesn’t make eye-contact, and makes no effort to communicate. The mother says she will do those things when she is ready, however she brought her to the clinic today because Kelby has been having uncontrollable fits and thinks she may have an infection. What is the issue? Which developmental category is affected? What are possible developmental negative consequences now and as time progresses? What interrelated concepts can be related to this condition now and as time progresses?