Nagmumuta ang mata

Hi mga mommies, Just want to ask an advice kasi yung 2 kids ko (3y.o and 2y.o) nagmumuta yung eyes nila. Nauna yung eldest ko parang Last Thursday tapos nawala din ng Saturday then kahapon meron nanaman. Yung bunso naman nung Saturday lang meron. Then wala na din simula kahapon. Di naman sila iritable at walang lagnat etc. I’m just worried why. Thanks in advance po. Pls respect post #advicepls