In a typical meat goat operation, 10% of the kids born live die before weaning. A death loss of 5% in the breeding herd is considered normal. A typical breeding operation would expect to replace 10% of their breeding herd a year. These losses will be due to death and culling (selling unproductive animals from the herd).
Dairy goat operations will experience similar loss of kids but the culling rate in the adult females will be much higher--20% or more in some cases. If your death loss is greater than you expect, then you should talk with your local vet and county extension agent.