I have been trying to find the words to express my DD, because from the beginning this little girl has thrown me for a loop. She is wonderful and I love her more than anything, but to say she has been a challenge is an understatement. I worked with infants and toddlers everyday in my job, and thought that I knew at least the basics of caring for an infant, but still DD surprised me every step of the way with her intense reactions and needs. My pediatrician mentioned something about her being intense and "a high need baby" so after doing research, I found the perfect description and information about her personality type here:
http://www.askdrsears.com/?q=topics/fussy-baby/high-need-baby/12-features-high-need-baby

It has definitely been helpful to know, although I'm still struggling with how to handle certain things, especially sleep!
Anyone else have a particularly tough baby or toddler?