Walk down the formula aisle of any UK supermarket and you will find a bewildering range of tins promising everything from easier digestion to longer sleep. Most of these claims are, at best, weakly supported by evidence. Understanding what each formula type actually contains — and what the NHS and independent researchers say about them — will help you make a confident decision without spending more money than necessary.
First infant formula (also called stage 1 formula) is the only type recommended from birth by the NHS. It is suitable for the entirety of the first year of life and, if you are not breastfeeding or are combination feeding, it is almost certainly the formula your baby needs.
All first infant formulas sold in the UK must meet strict EU-derived regulations, which means they are nutritionally equivalent regardless of brand. The primary protein source is whey, which is more easily digested than casein. This is important because newborn digestive systems are immature, and whey-dominant formula more closely resembles the protein profile of breast milk.
If your baby is growing well, producing wet nappies, and seems reasonably settled after feeds, there is no evidence to support switching away from first infant formula.
Hungry baby formula is casein-dominant, meaning it contains more of the harder-to-digest casein protein. The theory is that it sits in the stomach longer, keeping babies fuller between feeds.
The NHS does not recommend hungry baby formula. Research has found no consistent evidence that it reduces feeding frequency or improves sleep. Because casein is harder to digest, it may actually cause more discomfort in some babies. If your baby seems unsatisfied after feeds, the more likely explanation is a growth spurt, a feeding technique issue, or insufficient volume — all of which are worth discussing with your health visitor.
Comfort formula is partially hydrolysed — the proteins have been broken into smaller fragments — and contains reduced lactose. It is marketed for babies who suffer from wind, colic, and constipation.
The evidence here is mixed. Some studies suggest that partially hydrolysed formula may reduce crying in some babies, but the effect sizes are modest. The NHS notes that if your baby has symptoms of colic or digestive discomfort, it is worth speaking to your GP or health visitor before switching, since there may be another cause. Comfort formula is not appropriate for babies with confirmed cow's milk protein allergy (CMPA); they need a fully hydrolysed or amino acid-based formula prescribed by a doctor.
Anti-reflux formula (sometimes labelled AR formula) contains thickening agents — usually rice starch or carob bean gum — which make the feed thicker and less likely to be brought back up.
This can be helpful for babies with significant reflux who are losing weight or clearly distressed after feeds. However, it should ideally be used under the guidance of a GP or paediatrician, since reflux that is severe enough to warrant medical intervention deserves a proper assessment. Anti-reflux formula can also be harder to draw through a teat, requiring a faster-flow teat than you might otherwise use.
It is also worth noting that many babies bring up milk regularly (posseting) without it causing any distress or affecting growth. This is called gastro-oesophageal reflux (GOR) and is considered normal. Only when it causes significant distress or poor weight gain does it become gastro-oesophageal reflux disease (GORD), which may need treatment.
Follow-on formula is marketed for babies aged six months and over. The NHS is unambiguous: it is not needed. First infant formula remains suitable throughout the first year, and follow-on formula offers no nutritional advantage.
Follow-on formula exists primarily because EU regulations prohibited advertising first infant formula to parents — but permitted advertising of follow-on formula. This regulatory quirk has allowed manufacturers to build brand recognition they could not otherwise legally achieve. The Advertising Standards Authority and various health organisations have noted this for years.
If your baby is over six months, eating a range of solid foods, and drinking first infant formula, there is no nutritional reason to switch.
Several formulas are only available on prescription and are intended for babies with specific medical conditions:
If your baby has been diagnosed with any of these conditions, their formula will be managed by their GP or a paediatric dietitian.
Organic formula meets the same nutritional standards as standard formula but is produced from milk from organically raised cows. There is no evidence that organic formula offers any health advantage over standard formula. If the cost is manageable for your household, there is nothing wrong with choosing it, but there is equally no evidence-based reason to do so.
For the vast majority of babies who need formula, the decision is simple: use a first infant formula from birth through the first year. If your baby has specific symptoms — persistent reflux, confirmed allergy, or significant digestive distress — speak to your GP or health visitor before switching formulas, rather than working through the range on the supermarket shelf.
Brand loyalty matters much less than understanding what is actually inside the tin.
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