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Child · 1 to 12 years

Slow weight gain in children

When a child's growth chart isn't tracking as expected. Looking at intake, absorption, activity and the bigger picture, alongside your child's medical team.

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Best forChildren 1 to 12
FormatOnline · 60 minutes
IncludesWritten plan
Fee£90 new patient
Child enjoying a healthy meal
Colourful fresh food for children
Parent and child preparing food together
Baby exploring food during weaning
Fresh fruit and vegetables
Family mealtime with healthy food
Child with a balanced plate
Healthy ingredients for children's meals
Baby-led weaning with finger foods
Mother feeding infant
Happy family eating together
Child enjoying a healthy meal
Colourful fresh food for children
Parent and child preparing food together
Baby exploring food during weaning
Fresh fruit and vegetables
Family mealtime with healthy food
Child with a balanced plate
Healthy ingredients for children's meals
Baby-led weaning with finger foods
Mother feeding infant
Happy family eating together

What a proper assessment looks at

Faltering growth in children is rarely just 'they're a small eater'. When I see a child who isn't gaining weight as expected, I look at the full picture: dietary intake (what, how much, how often), absorption (any gut symptoms that suggest food isn't being properly absorbed), activity levels (active children burn significantly more than sedentary ones), and any underlying conditions that might be at play.

Coeliac disease, food allergies, inflammatory bowel disease, chronic constipation - as outlined in the NICE guideline on faltering growth, these can all present with poor growth, sometimes as the main or only sign. Investigation for these is often part of the medical workup. I work closely with GPs and paediatricians to make sure nothing medical is being missed while we address the dietary piece.

Sometimes the cause is straightforward: a child who fills up on milk or snacks before meals, or one whose appetite dropped after an illness and never fully recovered. Other times it's more complex. Either way, a structured assessment gives you a clear picture and a clear plan, which is much better than guessing.

Calorie density - getting more from less

One of the most useful strategies for children who aren't gaining well is increasing calorie density rather than volume. If a child has a small appetite, trying to get them to eat bigger portions usually fails and creates mealtime stress. Instead, I focus on making the food they do eat work harder.

There are well-established ways to increase the calorie density of meals a child already eats, using everyday ingredients. The specifics depend on what your child accepts, any allergies or intolerances, and their overall dietary pattern — which is exactly what I work through in a consultation. Small, targeted changes can meaningfully shift the growth trajectory without requiring the child to eat larger portions.

I also look at meal and snack structure. Some children do better with smaller, more frequent meals rather than three big ones. Others need the gap between meals widened so they arrive actually hungry. There's no one-size-fits-all answer - it depends on the child and the family routine.

When weight gain is unexpectedly rapid

Sometimes I see the opposite concern - a child who's gaining weight too quickly or has had a sudden jump. This can happen after starting a new medication (particularly steroids or some epilepsy medications), during recovery from illness, or sometimes without an obvious trigger.

Rapid or unexpected weight gain deserves the same structured assessment as poor gain. Is the dietary intake genuinely excessive, or is something else going on? Endocrine conditions, medication side effects, and psychological factors all belong in the differential. I don't assume it's 'just eating too much' any more than I assume poor gain is 'just not eating enough'.

If your child's growth chart has changed direction - whether up or down - and nobody has properly looked into why, a dietetic assessment is a good starting point. The BSPGHAN recommends early investigation of growth concerns in children, and I look at intake, absorption, medical history and the bigger picture, coordinating with your GP or paediatrician as needed.

Supporting weight gain with ADHD

This is a common concern. Stimulant medications used for ADHD commonly suppress appetite, and some children lose significant weight after starting them. Parents are often caught between 'the medication is helping their focus and behaviour' and 'they're barely eating'.

There are practical strategies that can help — meal timing, calorie density, and making the most of the eating windows that do exist. The specifics depend on the medication, the child's routine, and what they'll actually eat, which is what I work through individually in a consultation.

If weight loss is significant or ongoing despite dietary strategies, that's a conversation to have with the prescribing clinician about dose or medication adjustment. My role is making sure the nutrition side is optimised so you're getting the most from whatever eating opportunities exist.

Common questions

Common reasons: insufficient calorie intake, increased energy expenditure (active children burn a lot), malabsorption (coeliac, allergy, IBD), or sometimes a constitutionally smaller child following their own growth line. A proper assessment distinguishes these and gives you a clear direction.
The focus is on calorie-dense, nutrient-rich foods — 'calories with nutrition' rather than empty-calorie additions. The specifics depend on what your child already eats, any allergies, and their nutritional gaps. A consultation builds a practical plan around your child's actual diet.
Inadequate intake is the most common, but malabsorption (coeliac disease, food allergies, IBD), high energy expenditure, chronic illness, and medication side effects all feature. Assessment needs to consider all of these rather than assuming it's just about eating more.
Meal timing, calorie density, and working with the medication schedule rather than against it are all part of the approach. The plan needs to account for your child's specific medication, routine, and appetite patterns. If weight loss is significant, dose or medication discussions with the prescriber may also be needed alongside dietary changes.
The approach focuses on calorie density rather than portion size — making existing meals and snacks work harder nutritionally. The specific additions depend on your child's current diet, any restrictions, and what they'll accept. A consultation gives you a tailored plan rather than generic advice.
If they've crossed two centile lines downward on the growth chart, if there's actual weight loss rather than slow gain, if there are gut symptoms or signs of malabsorption, or if your instinct says something isn't right. Earlier assessment can help identify simpler approaches.
Hypothyroidism, Cushing's syndrome, genetic conditions like Prader-Willi, and some medications (steroids, certain epilepsy drugs) can all cause weight gain. These are relatively uncommon but worth considering if weight gain is rapid, unexplained, or accompanied by other symptoms.
Often inadequate calorie intake relative to needs, but coeliac disease, food allergies, IBD, chronic infections, high activity levels, and constitutional small stature are all in the mix. The word 'underweight' itself needs context - some children are small but growing perfectly on their own line. Assessment separates the concerning from the constitutionally normal.
Related

Other things I help with.

Child · 1 to 12 yearsHealthy eating for childrenRead more
Child · 1 to 12 yearsFeeding difficulties in childrenRead more
Child · 1 to 12 yearsChildren with inflammatory bowel diseaseRead more
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Book a consultation

A clear plan,
built around your little one.

All consultations are online and you can self-refer directly. You'll receive a written plan after every appointment.

How it works
Initial consultation · £90

Thorough assessment & plan

Your first appointment is 60 minutes. It includes a full clinical and dietetic assessment, and you'll receive an agreed, written plan to take away.

Follow-up · £60

Review & adjust

Follow-ups are 30 minutes. We review the plan, problem-solve anything that's come up, and adjust guidance as your child progresses.

What's included
Full dietary and clinical history
Growth chart review and interpretation
Assessment of current intake and feeding patterns
Identification of any nutritional gaps or concerns
A clear, written plan with specific recommendations
Guidance on next steps and when to come back

Currently self-pay only. All fees are VAT-exempt as registered healthcare services. I provide receipts with my HCPC registration details which you can submit to your insurer.