Weighing day: how often, and what to ignore.

Weight is the number parents check most, and it is also the one that moves around most for boring reasons. A full diaper, a big feed ten minutes earlier or a different set of scales can shift a reading more than a week of real growth. So the useful questions are how often to weigh, and which readings to let go.

This is a plain guide to both, for the months after the newborn checks are done.

The first two weeks are different

Almost every baby loses some weight in the first days after birth, before feeding is properly established. That is expected, and it is why your midwife or kraamzorg weighs your baby more often in the first week or two. The question then is a simple one: is your baby on the way back to their birth weight? Most babies are at or above it by about two weeks.

Those early weighings are done for you, on a schedule your care team decides. If they want to weigh more often, that is their call to make, and worth following.

After that, less is more

Once a baby is back to birth weight and feeding well, there is little to gain from frequent weighing. NHS guidance, for example, suggests weighing no more than once a month up to six months, no more than once every two months between six and twelve months, and no more than once every three months after the first birthday, unless there is a reason to check sooner. Your own country may use a different rhythm. In the Netherlands, the consultatiebureau sets its own schedule of visits.

The reason for the spacing is not that weight stops mattering. It is that growth over a few days is small compared with the normal wobble in a single reading. Weigh too often and you mostly measure the wobble.

What to ignore

One reading that is lower than the last. Babies do not gain in a smooth line, and a heavy diaper or an empty tummy can explain a dip on its own. It only becomes information when the next readings point the same way.

A different scale. The pharmacy scale, the clinic scale and the one at home will rarely agree to the gram. Compare readings from the same scale where you can, and treat a jump between two different scales as a change of scale, not a change of baby.

Other babies. A cousin who was bigger at the same age, a friend whose baby gained faster: none of it tells you anything about yours. A baby follows their own line, and the percentile post explains why a lower line is not a worse one.

The last decimal. Grams are fun to look at and mostly noise at home. The direction over weeks is what counts.

If you weigh at home

You do not have to. Your check-ups will weigh your baby either way. If you do, make the readings comparable: the same scale, roughly the same time of day, the same clothing (or none), and ideally before a feed rather than straight after. Write down the date with the number. A weight without a date is close to useless a month later.

And keep the gaps long. A weekly weighing you can ignore is better than a daily one that sets the mood for the whole day.

What is worth a call

Weight on its own rarely tells the full story. What gets attention is a pattern: readings that keep going down, or a baby who has clearly stopped gaining, especially together with other signs. Fewer wet diapers than usual, a baby who feeds much less, seems unusually sleepy or is hard to wake. Last week's note on the boring data that catches problems early covers the diaper side of this, because the wet count changes several times a day while the scale only changes when you step on it.

How Little Bean keeps it simple

In Little Bean you log weight, length and head circumference with the date of the measurement, in metric or imperial. The field shows the last reading, and as you type a new one it shows the difference since then and the date it was taken, so you see the change rather than a lone number. Stats plots the readings on the WHO curves for your baby's age and sex, and the export in settings turns them into a PDF with the same charts for the check-up.

What it does not do is ask you to weigh. There is no weigh-in reminder and no daily target. You log a measurement when you have one, from the clinic or from home, and the line builds from there. The plans page lists what each plan includes.

Weigh less often than you are tempted to, compare like with like, and read the line rather than the dot. The scale is a slow instrument, and it works best when you let it be one.

If your baby is losing weight, has not regained their birth weight by around two weeks, is feeding much less, has fewer wet diapers, or seems unusually sleepy, contact your midwife, health visitor or doctor. A log helps you see the line; a professional is the person to read it with you. Nothing here is medical advice.