Oo normal pa yan, lalo na at 3 years old pa lang, maraming kids naman na nag-drool pa around that age especially kapag teething pa or nakatuon lang sa laro! Pero kung sobrang laki ng paglalaway or may kasabay na breathing issues, better check with your pedia para ma-rule out kung may tongue tie man or other concerns, kasi a few of my mommy friends had similar situation at discovered may minor issues na madaling ma-address pa lang.