Specialised Infant Milks in the UK

Why specialised milks are needed

Breastmilk remains the gold standard for infant nutrition, but a proportion of babies cannot be exclusively breastfed due to medical, anatomical or social reasons. In many of these cases standard cowmilkbased formula (CMF) is appropriate, yet some infants present with specific metabolic, gastrointestinal, or allergic problems that require a tailored approach. The term specialised infant milk (or special formula) in the UK encompasses any infant formula that has been modified beyond the composition of standard CMF to meet a defined clinical need.

Health professionals must be able to differentiate between a genuine clinical indication and a preferencedriven choice, as specialised milks are often more expensive and may be subject to prescription restrictions.

Main categories of specialised milks

1. Allergyfocused formulas

• Extensively hydrolysed formulas (eHF) protein is broken down into peptides <3kDa, suitable for most infants with IgEmediated cowmilk protein allergy (CMPA).
• Partially hydrolysed formulas (pHF) weaker hydrolysis; not recommended for confirmed allergy but sometimes used for infants at risk.
• Aminoacidbased formulas (AAF) contain free amino acids, indicated for severe CMPA, eosinophilic oesophagitis, or when eHF fails.

2. Lactosereduced or lactosefree formulas

Used in infants with galactosaemia, severe lactose intolerance, or after certain gastrointestinal surgeries. These formulas replace lactose with glucose polymers or maltodextrin.

3. Gastrointestinal (GI) specialist formulas

• Extensively hydrolysed protein with prebiotics for functional constipation or colic.
• Mediumchain triglyceride (MCT) enriched formulas for malabsorption syndromes, short bowel syndrome or pancreatic insufficiency.
• Lowresidue formulas reduced fiber and fat for infants with intestinal obstruction or severe diarrhoea.

4. Metabolic and growthrelated formulas

• Phenylalaninerestricted formulas for phenylketonuria (PKU).
• Highenergy, highprotein formulas for failure to thrive, preterm infants beyond the neonatal unit, or infants with increased metabolic demand.

5. Preterm and very low birth weight (VLBW) formulas

Although many NICUs use specialized preterm milks, certain infants discharged home may need a continuation product that provides higher protein, calcium, and energy density than standard term formula.

Prescribing and dispensing guidance

In the UK, the majority of specialised milks are classified as prescription only medicines (POM) and must be prescribed by a qualified health professional. The following steps help ensure correct use:

1. Confirm the clinical indication use a structured assessment (e.g., allergy testing, metabolic screening, growth chart review).
2. Select the most appropriate product follow the hierarchy (eHF AAF for CMPA, for example).
3. Document the rationale include diagnosis, previous formula trial, and expected duration.
4. Arrange followup reassess growth, symptom control, and tolerance after 24 weeks.
5. Consider cost and supply liaise with the pharmacy to verify availability and any local formulary restrictions.

Where a product is not a POM (e.g., some lactosefree milks), it may be purchased over the counter, but the same clinical verification is recommended.

Common clinical scenarios

Case 1 IgEmediated cowmilk protein allergy

Infant < 12months presents with urticaria, vomiting and bloodstained stools after feeds. After skin prick testing confirms CMPA, switch to an eHF (e.g., Nutramigen) and monitor for symptom resolution within 710days. If symptoms persist, consider AAF.

Case 2 Failure to thrive (FTT) despite standard formula

A 6monthold gains <15g/week on standard CMF. Assessment reveals high energy needs and inadequate protein intake. Prescribe a highenergy, highprotein formula (e.g., Preterm ReadytoUse) delivering 90kcal/100ml and 2.3g protein/100ml. Reevaluate weight gain after 2weeks.

Case 3 Galactosaemia

Newborn screening indicates classic galactosaemia. Immediately replace breastmilk or standard formula with a lactosefree, galactosefree formula (e.g., Galactoguard) to prevent liver failure.

Case 4 Short bowel syndrome

Infant postresection (<50cm remaining small intestine) is on standard formula with ongoing diarrhoea and poor weight gain. Initiate an MCTenriched formula and add a probiotic (e.g., Lactobacillus reuteri) as per local protocol. Provide micronutrient supplementation (zinc, fatsoluble vitamins).

Safety, labelling and regulatory points

• All specialised milks sold in the UK must comply with the Infant Formula Regulations (EU) 2016/127 as retained in UK law.
• Check the label for For infants with and the specific clinical indication. Do not rely on marketing claims alone.
• Watch for rehydratable versus readytouse preparations; the latter are sterile and preferred for preterm or immunocompromised infants.
• Adverse events (e.g., allergic reactions to hydrolysed formulas) must be reported through the MHRAs Yellow Card scheme.
• All products contain a batch number and expiry date record these for traceability.

Useful UK resources

• British Dietetic Association Infant feeding guidelines
• National Institute for Health and Care Excellence (NICE) Nutrition in infants and young children
• British Paediatric Surveillance Unit Allergy and metabolic disease alerts
• Infant Formula Makers Association Product specifications and safety updates
• MHRA Yellow Card Report adverse reactions