Fawnly
Baby Weight Tracker
Plot your baby's weight over time and see whether their weight gain is on track. Your data stays in your browser - and you can download it to keep, then re-upload it any time.
A gentle note. This is a guide, not a medical assessment. Health visitors track growth using the centile charts in your baby's red book. Speak to your health visitor, midwife, GP or a feeding consultant if you're ever worried. It's completely normal for babies to lose a little weight in the first days (most lose around 5-7%)[1] and regain their birth weight by about 3 weeks[2]. A loss of more than 10% of birth weight in the early days should be checked by your midwife or health visitor[3] - so add your baby's birth weight below and we'll flag it for you.
Your baby
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Weight-for-age (WHO centiles)
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The curved lines are the WHO weight-for-age centiles used in the UK red book (2nd, 9th, 25th, 50th, 75th, 91st, 98th). It's very common - and often completely normal - for a baby to change the centile they're tracking on as they settle into their own pattern. This tool doesn't offer guidance on what your baby's weight means - if you're ever concerned about their weight or feeding, please check with your health visitor, midwife, GP or a feeding consultant.
Weigh-ins
Colour guide (per age, vs NHS/WHO averages): ● On track - gaining at or above the expected weight gain for their age; ● Slow - 50-100% of the expected gain (keep an eye and mention at your next review); ● Very slow - under 50% of the expected gain, or losing weight (worth raising with your health visitor). Early newborn days aren't colour-judged (dips are normal).