Mood and tantrums of kids are never predictable. They can find even a slightly unpleasant thing so annoying and can cause a tantrum. Most of the time the reason behind their tantrums is not the “actual” Reason. Sometimes they can be hungry, tired, or just cranky but they will be moody about a completely different thing. You must have thought of snacks, milk bottles, favorite toys, etc but still, these things are not working for you and your baby. When a big bad mood strikes a little kid there can be plenty of reasons causing them. Too little sleep and too much junk food can trigger serious moods. But sometimes the set-off point for the terrible mood remains completely unknown.