I've read that when ducks start laying, their eggs will be on the small side and you may get some weird things. I only have two ducks laying at the moment. They are consistent every morning. My cayuga lays eggs that average around 68 grams. My Welsh harlequins eggs average 56 grams. At what stage to they become larger and how heavy can I expect them to be. I know the potential for larger eggs is there as my w.h. laid one the other day that weighed 91 g. It was a monster double yolker. Thanks, Chris.