One of the most important steps in the fostering process
We cannot stress enough how important it is to make sure your foster kittens are up to date with their vaccinations and preventative care treatments. This includes worming, flea treatment, vaccinations and sterilisation. This last point is crucial - sterilisation prevents unwanted and orphaned kittens from accidentally occurring, and essentially it helps to reduce the number of stray kittens on the streets!
The sooner this is done, the sooner they will be ready for adoption, as kittens are more likely to be adopted when they are younger. In Western Australia, it is illegal to sell/adopt out kittens without being sterilised or have a voucher to be sterilised.
After you have completed all preventative care measures including sterilisation, healthy kittens should be ready for adoption from about 8-10 weeks.