DS is 4.9 and has recently been getting very worked up over tiny things. It's getting to the point know where he'll be having a couple of tantrums a day, with a few major meltdowns a few times a week. It's worse than when he was a toddler and he gets himself into a state over the smallest things. Is this normal for his age and how often do your 4-5 year olds have tantrums?