My little Monkey is not so little anymore. . . but I scrapped a page using Sugar Moon Designs' Sock It To Me Monkey kit of when he was just shy of 4 months old.
We had a "rule" when Tristan was a baby - whenever he started being grumpy, he would go upside down. And majority of the time, it worked - no more grumpiness. :)
Grumpy babies go upside down.
Preview of kit (image linked to store):