Which activities I can do wid my 2 n half month old baby for development of brain?

There are so many things at home also that you can let your baby do and that will help not only in brain development but overall development of the child. You can give her say forks, spoons, serving spoons all together and can tell her to separate them. You can draw things for him and let her colour them according to the numbers that you give to each colour. You can get activities books for her that are meant for her age. They are very good for engaging kid''s mind. I myself get such books when I run out of ideas as what next should I do.