In “Storey’s Guide to Raising Ducks”, Dave Holderead talks about force-molting his ducks to give them a break from laying.  It sounds pretty rough but basically you withhold food and water, for a couple DAYS, which forces them to stop laying and molt.  He says the best time to force-molt ducks is when egg production is slowing and it isn’t too cold.  It takes several weeks before laying resumes. The this is basically his schedule:
1st day: Discontinue any artificial light and remove all water and feed.
2nd and 3rd day’s:  Provide drinking water but no feed.
4th day: Start feeding again but feed only whole oats free choice.
18th day: In addition to the oats supply high protein waterfowl feed in a separate bowl.
42nd day:  Gradually replace oats and high protein feed with layer feed.
I have accidentally caused my ducks to do something like this when I switched their feed because the feed store stopped carrying what I was using.  I am curious what you think of this Isaac O? Good or bad idea?
		
		
	 
That does sound pretty rough; I very rarely under any circumstances take away feed, or water from the birds, especially the latter. If on day one, you were to take all water sources away, and a duck was still forming an egg, that could very well prove fatal. 
In the wild, ducks eat numerous amounts of things, ranging from roots, insects, tubers, fish, seeds, fruit, etc. We have done a good job formulating specific pellet foods to satisfy their nutritional needs, but oats do not. Oats lack several vitamins and minerals, so feeding it for as long as he suggested could very well lead to nutritional problems.
If you have a pretty large enclosed coop, you could "attempt" to leave the birds in the coop an hour or two longer than usually do, and that itself would greatly reduce egg production. Edited to reemphasize what Kale said here:
 
"Your birds are so young I wouldn't worry about it unless they are having reproductive problems. Most of my birds were more serious about laying in the winter when they were younger, and slowed down as they got older. Personally, I would let them have a natural daylight schedule - so if you are giving them artificial light at night you might consider stopping that."