From the perspective of the species, it’s perfectly unmysterious why people have children. From the perspective of the individual, however, it’s more of a mystery than one might think. Most people assume that having children will make them happier. Yet a wide variety of academic research shows that parents are not happier than their childless peers, and in many cases are less so. This finding is surprisingly consistent, showing up across a range of disciplines.
Researchers have known for some time that parents with minors who live at home report feeling calm significantly less often than than people who don't live with young children. Parents are also angrier and more depressed than nonparents — and each additional child makes them even angrier. Couples who choose not to have kids also have better, more satisfying marriages than couples who have kids.