Hi, i'm mother of 3 kids. I have 2 kids in toddler age. 1 is turn to 2 years old n other is turn to 3 years old. They often to cry alot and they force them self to cry, and the next day they will fall sick fever cough n flu. Is that normal for them? And they often fall sick too. Like example. The brother fall sick. The next 2 3 day the little sister will get sick too.