My 18 month old cries, sometimes screams when I wash her hair , not when I comb it or anything just when I wash, we use a gentle shampoo with no dyes or perfumes in it, she also cries and screams when her diaper is being changed and we use the wipes to clean her, like she is in pain in both cases. Could these be related? She has done this consistently since she was about 6 mos old. My pediatrician looks at me like I am whacked when I ask him about it!