Drooling is normal in the first two years of life. Infants don't often develop full control of swallowing and the muscles of the mouth until they are between 18 and 24 months old. Babies might also drool when they're teething. Drooling is also normal during sleep. The average age for the first baby tooth is 6 months, but some babies don't get their first tooth until they are 14 or 15 months old. We usually wait till 16 months before considering additional tests. As far as your above mentioned symptoms,it doesn't appear to be a matter of concern.

Drooling Can be normal Teething if not 13 months considered delay Any tone abnormality in limbs ( stiffness/ flopiness)?

Drooling of saliva is normal only