Two threads: the numbers and the firsts
Growth tracking works best as two records running side by side. The first is measurement — a regular weight, taken the same way each time, written down rather than remembered. The second is milestones: the firsts and changes that never show on any scale, from the first confident jump onto the sofa to the week the tiny milk teeth gave way to adult ones.
Kittens change so quickly that memory blurs the sequence within weeks. A dated note made on the day — however brief — preserves an order you will otherwise reconstruct wrongly, and that order is genuinely useful when a vet asks when something started or changed.
Weighing without turning it into a battle
Choose a method your kitten tolerates calmly and repeat it exactly. Many owners weigh themselves holding the kitten, then weigh themselves alone and subtract; others use a small pet scale with the kitten settled in a familiar box or carrier placed on it. Either works, provided the method, the time of day, and the kitten's state stay roughly consistent — a weight taken straight after a big meal is not honestly comparable with one taken before breakfast.
Short, regular intervals suit a fast-growing kitten better than rare, anxious checks. Write the figure down immediately, with a word or two about appetite and energy beside it. A single number means little; a line of numbers with notes becomes a picture your vet can read at a glance.
Which milestones are worth writing down
Note the developmental firsts as they land: eating solid food, using the litter tray reliably, first vaccinations and vet checks, neutering when it happens, and the arrival of adult teeth. Add the behavioural ones too — first exploration of a new room, first calm handling by a visitor, the point where play sessions lengthen and sleep stretches shorten — because confidence is growth as surely as weight is.
Also record the small regressions without panic. A kitten who hides again after a household change, or whose appetite dips for a day after a vet visit, is giving you context that makes the next note easier to interpret. The log's job is honesty, not a highlight reel.
When the record should prompt a call
A growth log earns its place when it changes what you do. If the line of weights flattens or falls across successive checks rather than rising steadily, if a milestone you expected simply does not arrive while littermates or the usual pattern suggest it should, or if appetite, energy, or litter habits shift alongside a stalled weight, that is the point to call your vet and bring the record with you. Concrete notes turn a vague worry into a conversation a vet can act on.
Between those moments, the log is also a prompt for questions you would otherwise forget to ask. Jotting them against her profile as they occur to you — and putting them to KinsLe's Kinny when you want guidance in the moment — means each stage of kittenhood gets met with the notes from the last one still in front of you.