A team of British scientists is conducting a large scale study that hopes to discover why a baby laughs.

Dr Caspar Addyman said that understanding babies would help them understand adults and as babies are "little scientists" who are discovering the world, researchers can discover a great deal through them.
Addyman said that their research also tries to find out which parent babies find the funniest and the general temperament of a baby.
The researchers are also trying to discover a correlation between laughing babies and a calmer temperament through a different questionnaire.
Addyman added that ninety per cent of babies have smiled in the first two months and laughed just a few weeks after that, while some babies have laughed unambiguously at just a few weeks old.
Source-ANI