Omega 3 is a very important supplement, especially for kids!
Most people don't know this story but some decades ago there was a clear reduction in the brain function of kids and nobody knew why it was happening...
Turns out, the reduction in brain function was caused by the fact that some kids that had mothers that weren't producing enough milk started drinking cow and goat milk and these milks didn't have enough omega 3 in them.
When they realized omega 3 was really important for developing brains, kids started taking omega 3 straight from bottles in spoons, and now all the formulas for babies have omega 3 because people realized this.