LO1, 27 months, has started having some seriously intense tantrums - screaming, hyperventilating, generally inconsolable. She's 2 and she has a new sister, so I was expecting this to a certain degree. But I'm a bit concerned about the length of the tantrum and her inability to calm down at all. In the past few weeks, she's had 3 tantrums that have lasted nearly an hour. I try to ignore it, keep calm and let her feel whatever she wants, but guys, it's frightening how intense they are and how long she stays at a level 10 of upset-ness. I'm honestly not sure if this type/length of tantrum is normal or if there is something else going on. Is this just being 2? Should I be worried?