Final answer:
Regressions in one or more areas of development in children with Autism Spectrum Disorder are most typically observed between 2 to 3 years of age, which aligns with option '(a) Between 2 to 3 years'. It is during this time that key developmental milestones are expected to be reached.
Step-by-step explanation:
Regressions in one or more areas of development can be a concern for parents of children with Autism Spectrum Disorder (ASD). Such regressions, often characterized by a child losing previously acquired skills, are most typically observed between 2 to 3 years of age. This period coincides with when key social, communicative, and cognitive skills start to emerge and can potentially highlight developmental concerns indicative of ASD.
While regression can occur at various times, the option '(a) Between 2 to 3 years' is the most expected time for these developmental changes to become evident in children with autism. It is essential for caregivers to monitor their child's progress and seek professional guidance if they notice any signs of regression or other concerns about their child's development. It is also important to note that every child is unique, and not all children with autism will experience regression.
For any questions about child development or concerns about ASD, parents should consult their pediatrician or a specialist in child development.