Hi, I'm new to the forum. I found this site in my search for information on ways to help my 3 year old son. As an infant he was difficult to soothe. He wouldn't go to anyone, not even close family or friends. At 8 months, a gross motor delay was detected because he wasn't turning himself over. During the period of 8 months - 18 months he learned how to walk, but fussed and tantrumed through every intervention to teach him to move. At play groups, he insisted on sitting with me. He wouldn't play near the other children. By the time he was 2, he played away from me, but would be aggressive with other children - biting, pushing, yelling at them. Noises of all varieties startled him - anything from hearing a toilet flush in a distant room to a siren, would prompt him to ask, trembling, "What's that noise!?" To call him sensory defensive is putting it mildly! As he rounded the corner of 3, his behavior improved around children outside of the family, but at home he continued to intentionally aggravate his older brother (who is 5 and on the autism spectrum, and is easily irritated). In June, I decided to experiment with the gluten-free, casein-free diet because of my 5 year old son's diagnosis). No major difference in my 5 year old, but my 3 year old's behavior improved within a week. My 5 year old is diagnosis with Pervasive Developmental Disorder (PDD)-not otherwise specified. I realized something was amiss with my 5 year old from about the time he was 14 months old... It took a lot of perseverence to show the professionals what his deficits were. His behavior has dramatically improved as a result of his placement in Special Education preschool and my willingness to implement the behavioral strategies at home. His sensory symptoms have virtually disappeared. The areas where he has difficulty are initiating and maintaining conversation with children, intense interest in an unusual topic, perseveration on numbers, sing-songy prodosy, hyperactivity, and anxiety. What I am concerned about in my 3 year old is that "NO" is his knee jerk reaction to most everything I say; continued hypersensitivity to sound; he thinks there are monsters everywhere and storytelling/pretend play revolve around violent themes with monsters, dragons, dinosaurs, and bad guys; screaming; tells others very often "I'm mad"; disagreeable with adults and children; frequently, intentionally annoys his brother. Let me put it this way: the 3 year old's behavior has gotten in the way of me and my husband's joy - and to a certain extent, his brother's, who he is constantly attacking for no reason. I joined this board because I'm worried about my 3 year old and would appreciate any insights that other members have to offer. And I joined this board because I am tired. I'm tired from having already gone down the path of pursuing a diagnosis for my 5 year old. I'm tired from having 2 kiddoes who need extra support and attention from me throughout the day. I'm tired of going through this alone.