hi my daughter is 2.9 yr old. lately shes been crying alot for each n everything, if i say no no she start crying badly i wait for few mins to settle her but she dont calmdown n keeps on crying until she gets wat she want. if shes but n tired n sleepy then these tantrums are a lot more horrific . pls help me. n m doubtful if sweets n sugar r making her more cranky. are dey related? is dis any vitamin deficiency ?