ds is 19mo and still has the same routine as when he was tiddly. bath. cuddle +/- story depending on how sleepy and bottle of milk.
he's going into a new room, and new big bed after christmas so he's settled by the time dc2 arrives in april.
i think his bedtime routine will need to change as bigger kids don't do bottles for a start but i'm not sure what people do! 
please share! :)