I just wonder if this is also the birds first clutch ? If they are young or inexperienced, they might lay more eggs. So definitely something to watch out for.
If you spot any eggs in the box, just remove them.
get any equipment you may need now, it's a bit late to go shopping when they already need your help.
@Zara has a list.
I would hope all the equipment and products would have been bought already by now. But things you should always have on hand,
-Hand rearing formula
-Feeding utensil - I use syringes but always recommend feeding spoons to a novice
-Candy thermometer to check formula temperature
-brooder
-heating pad if your brooder is not a professional one
-Aspen shavings - Course pine is ok if you can´t get aspen. Never fine pine, and never ever cedar.
-Thermometer (digital) for monitoring brooder temperature
-Hygrometer for monitoring humidity inside the brooder
-Weighing scales - you can use a gram scale, or as your birds are budgies, a 0.01 scale
-Pedialyte, or natural unflavoured coconut water
-Papaya
-Nursery cage with plenty of perches (to move the birds into after they fledge)
You could also look at getting liquid supplements (should the adults needs them), discuss this with your vet.
You will also need a disinfectant on hand to sterilize your tools. Something like (here it´s ¨clorexidina¨, which I believe would be Chlorhexidina, or Chlorhexidine?). Leave to air dry completely.
If there´s anything I´ve said that you don´t have, I would be purchasing them quickly so that you have them on hand.
If you are going to sell the chicks for money, then really taking them for a check up at the vet before they go would be a good idea, to be sure you are only selling healthy chicks.
It is helpful when you have chicks, to inform your vet, so that they are aware, should anything go wrong and you need emergency help.
Given that the parents are mating, be sure to check all the chicks crops to be sure they are getting fed. If you see any not fed, give the hen a half hour or so to feed them, but if she doesn´t, pull that chick for hand rearing.
Welcome to the Avenue Carolyn