Singing, playing games where you sort of throw the baby around (like Down at the bottom of the deep blue sea or pretending baby is an aeroplane), dancing together, DS used to love sitting in his chair or in his carrier and watching me do things, tummy time was great and he was rolling over before 8w, I tried him with toys but not interested, he would rather I read him books (such as Narnia or Harry Potter - I needed something interesting!) and we cuddle and do jobs together.