How many clutches of eggs and normal for a cockatiel

[Hannah!]

And how many would they have to lay for it not to be healthy

 

[WillowQ]

I think two clutches would be normal but more would be a problem. It depends mostly on the health of your female cockatiel.

 

[Zara]

Any more than 3, and you should be talking with your vet how to monitor and proceed. Always handy to keep an egg diary for all cockatiels, budgies and lovebirds.

It depends mostly on the health of your female cockatiel.

This definitely plays a huge part in it.
Having a hen that is flighted and allowed time each day to fly and excersize, eats veggies and pellets and is healthy will have less chance of problems from egg laying (though it is never nil). I have a hen who lays just two eggs per clutch about once per year, but she has issues with egg laying even though she eats veggies and pellets, so she needs to be on supplements or she'lll end up hospitalised.

 

[WillowQ]

This is why it is so important to make sure your female bird has enough calcium in her diet. Calcium for eggshells is largely pulled from bone. If plenty of calcium, great. If too little calcium, thin shelled eggs or soft shelled eggs, thin bones, and I think inability to have adequate contractions and expel the egg. (And if the shell is not right it’s harder to push the egg out, too.).
This is why I like to have a cuttlebone or mineral block in my small to medium parrots cage. A pelleted diet should have enough calcium. Other diets without supplementation may not provide enough calcium.