⚠️ Medical Disclaimer: These tools are for educational purposes only and are not medical advice. Please consult your GP, health visitor, or NHS healthcare provider for any health concerns.
Free Tool

Baby Growth Percentile Tracker

Compare your baby's weight and height against WHO international growth standards. Covers 0 to 24 months with separate charts for boys and girls.

100% Free No Login Works on Mobile Data Stays Private

Baby growth tracking in the UK is built into your Personal Child Health Record (red book) which your midwife and Health Visitor maintain. This tracker gives you the in-between numbers between appointments. We use the WHO growth standards adopted by the NHS for under-2s and UK-WHO charts for older children. Helps you spot concerning patterns to raise with your Health Visitor.

📊 Baby Growth Percentile Tracker

WHO growth standards for boys and girls aged 0 to 24 months

Weight
.
Height
(

).

About this tool

This tracker uses World Health Organization (WHO) Child Growth Standards data. Percentiles compare your baby with other healthy babies of the same age and gender worldwide.

This is a screening tool only. Always consult your GP for accurate growth assessment and medical advice.

Step-by-Step Guide

How to use this tool

Use this at every paediatrician visit. Takes under 30 seconds to see your baby's growth percentile.

  1. 1
    Select your baby's gender

    WHO has separate standards for boys and girls. They grow at different rates.

  2. 2
    Enter age in completed months

    For 3 months and 20 days, enter 3. For under 1 month, enter 0.

  3. 3
    Enter weight in kilograms

    Weigh just before a feed. Enter to one decimal place (e.g., 7.2 kg).

  4. 4
    Enter height and click Calculate

    Babies under 2 are measured lying down. Your percentile appears instantly.

💡 Track the TREND not just one number

A baby consistently on the 25th percentile is perfectly healthy. Watch for sudden drops between visits.

⚠️ When to consult your paediatrician

If weight or height falls below the 3rd percentile or above the 97th, or there is a sudden significant drop, see your paediatrician.

FAQ

Frequently Asked Questions

If your baby is at the 60th percentile, they weigh more than 60% of babies their age. Healthy babies can be anywhere from the 3rd to the 97th percentile.
Not at all. Concern arises when a baby drops significantly from their established percentile, not just when they are at a lower percentile.
Use corrected age. Actual age minus weeks premature. If baby is 4 months but born 8 weeks early, enter 2 months. Continue correcting until 2 years old.
Small differences occur due to rounding. If the difference is more than 5-10 percentile points, check that you entered the same values.
Healthcare in UK

How baby growth and percentile tracking care actually works in the United Kingdom

UK pediatric care runs through the NHS. Generally well organised. Can feel slow at peak times. Your first call is usually NHS 111. Free, 24/7. They triage what is going on and tell you what level of care to seek. Sometimes a GP appointment via e-Consult. Sometimes A and E. Occasionally an ambulance. Out of hours GP services run evenings and weekends. Walk in centres and Urgent Treatment Centres handle the mid range stuff. A and E is for genuine emergencies, not routine fever queries, where you can wait many hours. For babies under 3 months though, A and E is the right call regardless. The NHS Pharmacy First service can also handle minor childhood things now without a GP appointment.

📞 Emergency contacts in the United Kingdom

In the UK, call NHS 111 for non-emergency advice 24/7. For emergencies, call 999. Many GP practices have an after hours triage line. Your Health Visitor is also a valuable resource for baby questions during weekday hours. Pharmacies like Boots offer free advice from pharmacists for non-emergency concerns through the Pharmacy First service.

Context for British families

What British mums actually deal with

British mums often feel pressure to wait it out before bothering the NHS. This is wrong thinking. NHS 111 was designed for exactly these calls. Staff are trained to triage and there is genuinely no judgment for calling. Health Visitors are an underused resource. They expect to hear about concerns in young babies. They can advise on what is normal during teething (mild temperature elevation, yes). True fever above 38 Celsius is something else and worth a proper assessment. British medical practice runs more conservative on medication than American practice. Calpol is the workhorse. Talk to your GP or pharmacist before alternating with Nurofen, NICE specifically does not recommend routine alternating.

More FAQs for UK

British-specific questions

Your Personal Child Health Record (red book) is the official growth record. Your Health Visitor records weight and length at developmental check appointments. This tool gives you between-appointment tracking. Bring both to your reviews so the Health Visitor sees the in-between data.
The UK-WHO chart combines WHO data (under 4 years) with UK data (4-18 years) because UK-specific reference data better reflects British children at older ages. The NHS uses this chart in your red book. Online charts may differ slightly. Trust your Health Visitor and GP interpretations.
Health Visitors arrange more frequent weight checks if your baby has had poor weight gain, prematurity, or feeding difficulties. They may suggest weekly or fortnightly checks until growth stabilises. This is precautionary, not necessarily concerning. The NHS has clear protocols for when to escalate to GP or pediatrician.
Explore More

Other free tools you might need

💉

Vaccination Tracker

Track the UK NICE 2024 vaccination schedule.

Use Tool →
📊

Milestone Tracker

Check developmental milestones by age.

Use Tool →
🍼

Feeding Tracker

Log and track your baby's feeds daily.

Use Tool →