Like mrsmac said, I wouldn't worry too much about it, but it is something to stow away for later if you need it.

My 2 yr old will scream the house down if we put her up on the trampoline, she HAS to climb the ladder herself so we often have to take her off the tramp to let her do it herself... She is normal. Very normal... but I have perspective from her older sister.

My 4 yr old would have held her breath until she passed out, or done self harm if we did something that wasn't what she thought was happening. She still will have massive melt downs if things don't go the way she thought they should, i.e. we give her the wrong coloured straw with her drink for dinner, she can't verbalise what is wrong but it takes an hour or so of screaming to work it out. She is in the diagnosis rollercoaster ride for Asperger's...

HTH.