Hmmm, looks like a glass bottle of some sort, but a glass bottle isn't a very safe toy for a baby. It's probably some sort of shiny rattle thing, the sort of thing photographers give to young children with very short attention spans to keep them busy and occupied 'till he can take the shot. Donal does look a little puzzled there.
In Rory you can see a hint of the man to be, his eyes and his smile are the same.
