Hi!
Cute ducklings... congratulations!!
Are they sexed...?
If ever you have a specific question, do ask it!
What I can already think to say... :
• 1 :
AT LEAST until you ducklings are grown up, they need to have an unlimited access to food and water - even at night!
• 2 :
NEVER let a duck have access to his food IF he doesn't have water to drink, because he then could choke on his food.
• 3 :
Be careful to use a big enough waterer : a duck needs to be able to plunge his entire head in his waterer, so to be able to clean his nostrils.
(There are reasons ducks' waterers are always so dirty...!!)
• 4 :
A duck needs water to swim, so his gland oil is stimulated enough to produce a sufficient amount of oil in order to keep his plumage waterproof!
(And a duck swimming regularly won't be infested by mites/lice!)
• 5 :
Watch over your ducklings very carefully IF you let them bath, and for the several first days, DO NOT let them bath/swim for more than 5 minutes per day : they don't produce oil for the time being, so they are at risk of waterlogging AND drowning.
(You actually can wait for your ducklings to be older to let them bath for the first time...
1-month-old would be fine, but even then, you will have to watch them - while they are bathing - for several days at least!)
• 6 :
A drake's - especially a young one's - libido is OUT OF CONTROL during mating season, making him particularly agressive then; and so : you need to think about a way to keep your drake(s) separated from your girl(s)... just in case!
A drake can indeed accidentally hurt - and even kill - a hen by continually mating with her...
...Just so you know :
It is advised to have at least 3 hens for 1 drake, but : 1 drake for 1 hen can actually work... so don't worry too much if you don't have enough girls for a boy. "Just" expect the worst, and monitor them carefully!
(I started with 2 drakes and 2 girls, and my ratio, though bad, still worked thankfully!)