Baby Laughter survey scientific update

The first results of our global survey were presented at an infancy conference last July. I thought I'd posted them here but it seems I forgot (typical absentminded academic).
Poster presented at International Conference for Infant Studies, Berlin, July 2014
Conclusions
- Babies first smile around 1.5 months and first laugh around 3.5 months. But with some individual variation.
- Laughter starts social, babies laugh at/with people not things
- Most things get funnier with age
- Babies think mummy and daddy are equally funny
- Parents think boys laugh more than girls
- Peekaboo is universally popular but tickling most reliable way get a baby to laugh
- Babies are moral and don't laugh at other people falling over, so Freud was wrong that child laugh is based on superiority or schadenfreude!
Thanks to everyone that took part. Baby Laughter survey results [pdf]]]>