the baby is 2 months old now and has started keeping salivary bubbles whenever she lays or sits is this normal or indicative of someone

A. Hello good evening !! Drooling ,spreading saliva is common no need to worry. by 3-4 months baby start social smile,recognise mother,things,responding to sounds,roll over and all obly check milestones physical and mental milestones month by month. Exclusive breast milk or formula milk until 5 complete months ,,they increase 400-900 gm per month by 5-6 months they double their birth weight .