Oo normal yan sa age na yan, haha! Most babies still drool a lot around 5 months kasi they're starting to explore their mouths and their saliva glands are more active na, one of my mum friends said her baby was literally drooling buckets pa sa age na yan. It's actually a sign na developing well siya, but just make sure lang na palaging dry ang bib at singit niya para iwas irritation, especially kung drool rash na agad nakikita mo.