My 2 month old baby has this "habit" of drinking bit by bit... Be it either formula or breast milk... Isit normal? And also is this "habit" to be worried about?

You may wish to check if it's colic. Colic may cause baby to geel uncomfortable during feeding and nake them drinks very small quantity each time. They are too young to tell you but as mothers, we should be able to tell. Monitor baby for a while and uf tou think that it's something that you are concern about, pls seek assistance.