Oo normal yan, first time mom! Around 3 months ang babies start mag-drool more kasi developing na ang salivary glands nila, at madalas pa sila mag-mouth kung ano-ano lalo na if teething phase na. Pero if she's acting normal, eating well, at walang fever, she should be fine, though if you're worried about the amount of saliva or kung may other symptoms, better check with your pedia lang to be sure.