Hi, my daughter is 21 months old and is having horrendous tantrum - she seems to have them for no apparent reason and they can last for up to half an hour - she lashes out and kicks her legs and arms and bangs her head off the floor. I have ignored them and tried not to give her attention for them apart from when she hits me and then I tell her "No". Is it normal for her to be having tantrums this bad? what techniques has anyone used that help? Thanks very much.