Looking at growth over time

Begin with the individual points

A growth chart is built from separate observations. Each marker should correspond to a measurement taken on a particular date. The line joining two markers helps your eye follow the history, but it does not establish what happened on every day between them.

For example, a point in January and another in March are two dated readings, not a daily record for February. If a period is blank, leave that gap in the history. Adding repeated values just to fill it would make the chart appear more complete while making the record less accurate.

Read growth with the rest of the child's history

Growth charts help a professional consider changes over time alongside a child's circumstances. A percentile is a reference position, not a score, and one isolated reading cannot tell the whole story. Ask the clinician involved to explain what the pattern means for your baby.

Bring relevant context rather than attempting to diagnose the curve yourself. You can say where the measurements came from and what you have noticed in day-to-day care. Keep records of professional advice separate from your own questions so everyone knows which is which.

Further guidance: Pregnancy, Birth and Baby: Understanding baby growth charts

Check the record when the line changes suddenly

Open the readings either side of the change. Check the date, measurement type, unit and baby profile, then compare each with its source. A difference between kilograms and pounds or a measurement entered on today's date can make a perfectly ordinary record look dramatic.

If there is no transcription error, keep the actual reading and its context. A note about a different scale or method can help at the next appointment. Do not silently discard an accurate reading because it interrupts an otherwise smooth-looking line.

Choose a summary that answers a question

A weekly summary can describe a particular period of care; a monthly view gives more room to see dated growth readings alongside feeding patterns. Pick a period relevant to your question rather than exporting every record simply because the option exists.

If you are asking about a specific measurement, include the earlier readings that give it context. If you are keeping a family memory, a concise monthly PDF can be easier to revisit than pages of individual events. In either case, make sure the baby's name, dates and display units are correct before sharing.

Keep readable memories and restorable backups separate

A PDF is designed for people to read. A ZIP backup contains the structured data needed for import. Saving one does not provide all the functions of the other, so choose according to what you want to keep. The website's one-measurement comparison is not a stored record of your baby's history.

Exports contain personal information and are not password protected by the app. Save them somewhere you control, check which baby and period they contain, and share them with the intended recipient. A file sent to another service becomes a separate copy from the live shared log.

Use appointments to make the chart clearer

At routine health checks, ask which measurements were taken and request the date, units and results for your record. If you have a question about a change, bring the chart and original readings rather than only the most recent percentile label.

Useful questions include: ‘Were these measurements taken the same way?’, ‘Which chart are you using?’ and ‘When should the next check be?’ You do not need to measure more frequently just to make the app feel active. A clear history should make care conversations easier and leave more room for ordinary family life.

Further guidance: Pregnancy, Birth and Baby: Routine health checks