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Growth and weight gain

Centiles are a guide, not a verdict.

Quick summary

What's happening: Babies grow in their own pattern. Trends matter more than single points.
What helps: Look at trend, nappies, mood and feeds together. Ask for help interpreting the chart.
When to get help: Crossing two centiles, static weight, lethargy or reduced wet nappies.
One tiny next step: Step away from the kitchen scales this week. Trust nappies and feeds.

What's going on?

Babies grow in their own pattern. Centile charts are a way of seeing how your baby compares to a large group of typically-developing babies — they are a guide, not a verdict on you or your feeding.

After the early weight loss in the first days (up to about 10% of birth weight) most babies regain birth weight by 2–3 weeks. From there, they tend to settle onto their own line. Some babies stay on the same centile, some drift up, some drift down — what matters is the trend over weeks, not single weigh-ins.

Babies grow in bursts. Big feed days, sleepy days, and even weight pauses around illness, teeth or developmental leaps are common.

Common signs and symptoms

Very common

Plenty of wet and dirty nappies for age.
Alert during awake windows, settled at feeds.
Following their own line on the chart, even if not the average.
Brief plateaus around minor illness or vaccinations.

Less common

Crossing two centile lines downwards over weeks.
Static weight over more than 2–3 weeks.
Very few wet nappies, sunken fontanelle, lethargy.

A single low or static weigh-in is rarely a problem on its own. The whole picture matters.

Is this normal?

Many babies drop a centile or two in the first months as their birth weight (heavily influenced by maternal factors) gives way to their own growth pattern.

Breastfed and formula-fed babies grow differently after 4–6 months. Breastfed babies often slow their weight gain compared to formula-fed peers — this is normal and well-documented.

From 12 months onwards, growth slows naturally as activity rises and appetite changes.

Practical things that help

Look at the trend over weeks
Day-to-day or week-to-week weights bounce around. Trend lines tell the truth.
Count wet and dirty nappies, alertness, mood and feeds
These tell you far more about how a feed is going than the scale.
Have your health visitor interpret the chart with you
A trained eye can spot the difference between 'finding their own line' and 'a pattern to watch'.
Step away from the kitchen scales
Frequent at-home weighing rarely changes care and almost always raises anxiety.

What can accidentally make it harder?

Weighing too often
Drives anxiety, which affects feeding, which affects weight, which drives more weighing.
Comparing centiles between babies
Centiles are about your baby's pattern, not a ranking.
Topping up without latch support if breastfeeding
Top-ups solve some weight issues and create others. Get a feeding assessment first when possible.

These are gentle observations, not blame. None of us avoid all of them all of the time.