For parents whose hearts break a little every time the sad tears start flowing, it can be helpful to understand how tears work.
Oppositional defiance disorder: When your kid isn't just 'difficult' - Today's Parent
Helping Children Who Cry Easily
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Why Your Brain Short-Circuits When a Kid Cries - The New York Times
Letting Babies Cry – The Facts Behind the Studies - La Leche League GB
How to Help a Baby Stop Crying
Happy Tears: There's Probably a Good Reason for Them
Opinion Yes, Raising Kids Can Be Tough. Why Are We So Reluctant to Talk About the Joy? - The New York Times
Why do we cry? This is what our tears reveal. - Vox
Kids who do these 12 things have 'highly sensitive' brains—why parenting experts say it's an 'advantage
Does your baby have early separation anxiety? - Today's Parent
Crying: The Power of a Good Cry - The New York Times