W.
It feels like stinging even though it's not painful too much. I have experience for pink eye myself and my daughter had her first pink eye when she was three-and-half year old. She was already terrified when I held her arms even before experiencing the eye drop. I guess both being held down and having stuff into eyes make kids scared. Since he is too young, doing quick is the best way! I tried to explain and make her prepared, but doing it before she realized what was happening to her worked the best. Good luck!