Babies and Happiness are not totally positively correlated, says a new Princeton study. Being a parent is not a true factor in happiness, but it does affect parents' emotions

The new study says parents with low levels of income and education that have babies are proven to be happier when they still live at home. But parents with higher levels of educations, babies does not affect happiness.

However, emotions and babies does have direct results. Parents with babies have a heightened level of emotions such as happiness, smiling, enjoyment, worry, stress and anger.

The study analyzed 1.77 million people in the US and 1 million people from 161 countries from 20008-2012.

Interestingly, the study found people without children felt physical pain more than parents.

Angus Deaton, a Princeton economics and international affairs professor said:

"It is simply a mistake to presume that because people deliberately want children and deliberately bring them into being that those people with children should have better lives."

"Non-parents are not 'failed' parents, and parents are not 'failed' non-parents. Some people like oranges, and some like apples, and we do not think that orange eaters should have better or worse lives than apple eaters."

"Life evaluation is not the same as experienced emotions, such as happiness, enjoyment, sadness, worry or stress." Deaton continues.

"The results show that, no matter what else is taken into account, parents experience more of all of these than non-parents. There are good days and bad, ups and downs."

The study made sure not to include non-parents that were frustrated that they could not bare children.

"If I wanted kids and couldn't have them, that sure would do bad things to me. But if I didn't want kids and got one because a stork happened to fly by, that wouldn't make me happy... People sort of get what they want."

The study also found that parenthood is linked to less life satisfaction in other parts of the world outside the richer, English-speaking countries.