With infants, play pretend games like peek-a-boo. Cover you face and say "where am I?" letting them still hear your voice. Show your facec and reassure your baby with a smile that you're still there. Take note of your baby's reaction during the game. If your baby seems uninterested, you can move on to another game.
With toddlers, comment on what they’re doing or looking at: When your toddler is playing with their toys, join in on the fun. For example, if dinosaurs are popular with your children, try commenting on their make-believe dino adventures to serve up loads of fun. “Your triceratops looks very fierce, how many horns does he have? Where does he find food?”