A small but powerful study from the University of British Columbia looked at this very question. Researchers worked with a group of 20 toddlers, all under the age of two. They designed a simple experiment to observe the children's emotional reactions.
First, each toddler was given some treats, like Goldfish crackers. Then, they watched as a researcher gave a treat to a puppet. Finally, the toddlers were given the chance to give one of their own treats to the puppet. The entire interaction was filmed, and coders rated the children's facial expressions for happiness.
The results were surprising. The study found that toddlers exhibited greater happiness when giving treats to others than when receiving treats themselves. This suggests the emotional rewards of helping others may be present from a very early age. It is a small study, but it points to a deep and often overlooked part of being human.