You can easily google activities for baby that age. You can carry the baby and do house tour, introducing the rooms and objects around the house. You can carry baby in football hold as tummy time. You can move a shaker slowly and let baby trace it. You can show black and white cards and talk about it. You can sing nursery rhymes and dance along holding your baby. Have fun!
there is an app available on ios called pathfinder health, it recommends many interesting activities to do wif baby for their development! its also said to be designed by developmental-behavioral PDs