My dd has just turned 17 mths and up until now she is an angel, a real sweetie. She has always been affectionate and sometimes now even more... She understands almost everything I say to her (amazes all my friends) so I guess the majority of her frustration is caused by not being able to communicate properly to me. Before when we went to the playground she would point to the swing if she wanted to go on it and say "uhh" meaning "up" and smile if a child was on it. Now she walks up to it, glares at a child if they are on it and screams like she is in pain and if I say anything like "Lets go on anotehr ride darling until this one if free or you can have a go in a minute" she scream louder shaking her head and flapping her arms. The other week she decided to stand on the slides ladder and not let anyone pass. Whats all this behavour about, I feel like however I react is wrong, any tips on dealing with this? Her behaviuor does not upset or make me angry, it amazes me how much emotion this little person can show to get what they want. What is the best reaction?