Keeping an administration is a boring chore, but it can be a very useful tool when you work with cats. As a pet owner it will be sufficient most of the time if you simply write remarks down in your diary. Should you have to go to a vet because your cat is limping, then it is convenient for you to know whether the animal is limping because it has fallen of off a cupboard or if something else has happened. Afterwards it often is difficult to remember exactly when something has happened.
For a professional cattery it is gets more complicated, especially when there are more breeding animals in the house. Questions like: "When was female X in heat the last time?", "When was the litter of female Y born?" and "Which of the 4 brown tabby kittens dropped in weight? Is it the same kitten that had problems eating last week?" can be hard to answer if you have to start digging in your memory. Most of the times you can retrieve this information, but with a well-maintained administration the information is much more reliable. Plus, such an administration comes in very handy if you might get sick yourself, and friends or family have to step in to take care of your animals. With one glance they can tell what is going on in your cattery.
The tables below are examples. Of course you can adjust them to your own wishes and situations.
In the table below I made space to fill in who the parents of the litter are, what the mating dates were, and all kind of other information about every kitten like the time of birth, which code you have given the kittens (when they have strong resemblances it might be a good idea to mark each kitten with nail-polish on their nails or with a safe text-marker in their coat) etc. If you want to add other, more important things you can simply add them or replace the columns I that used.
It is best to pick a set time on which you weigh the kittens every day, so not during the evening the first day, and in the morning the next day. This would give you a wrong picture.
If one or more of the kittens do not gain weight on one day, this is not a disaster immediately. Only if they do not gain weight for a few days in a row, or when they loose weight, there is reason to start worrying.