Rain pitter-pattering on the roof.
Next morning, I heard the pitter patter of my sisters moving around the house.
And when, perhaps one day, you hear the pitter-patter of tiny feet.
I've been a long-time fan of the tycoon games and the idea of having a portable zoo to take with me and care for like a newborn silver dual-screened baby made my heart go pitter-patter.
Perhaps there is a gadget that would make his or her heart go pitter patter.