I had no idea that my son was high needs until I had my daughter... (10 yrs later). I just thought that I was doing something wrong as a parent, and that I was a bad mom somehow. (it makes me sad now to know that I felt this way for 10 years...) When he was first born they all said "its colic...nothing you can do about it, just let him cry it out". When he was 3 months old and still crying they said "oh he must be teething, put whiskey on his gums" and I was 18 yrs old, had never even seen a baby before...so after 3 months of him crying every night I listened...
Plus of course the deal with adding cereal to his milk waaaaay too soon. So then we go on and he has ear infections and gets tubes in his ears at about 16 months old, then they say "oh its just because of the ear infections" and then "oh its just the terrible twos... you need to start disciplining him more". My parents yelled at me because I didn't want to spank my son, and didn't believe me when I said it just made the situation worse if I did do it. When my son was in kindergarten, the school said that if I did not put him on ridlin or something similar they would kick him out of school and call child services.
Eventually we got things switched around, but it took a LONG time because I spent so much time listening to everyone else tell me what I was doing wrong that I think I just made the problem worse. Now that I've moved away from all the well wishers and stood up to the 'authorities' (school, etc), my son is a happy, normal, highly energetic 10 yr old.