Follow-on milk is a formula designed for babies aged six months and older, marketed as a bridge between infant formula (or breast milk) and regular cow’s milk. It typically contains added iron and vitamin C to support babies during the weaning period when solid foods are being introduced. Despite its widespread availability, major health authorities say it is not a necessary purchase for most families.
How Follow-On Milk Differs From First Infant Formula
First infant formula, sometimes called “stage 1” or “first milk,” is designed to be a baby’s sole source of nutrition from birth. Follow-on milk, often labeled “stage 2,” is formulated for babies who are already eating some solid foods alongside milk feeds. The key difference is in the nutrient profile: follow-on milk generally has higher levels of iron and certain vitamins compared to first formula, with the idea being that older babies have greater iron demands as they grow.
However, the NHS states clearly that research shows switching to follow-on formula at six months has no benefits for your baby. First infant formula can remain your baby’s main drink throughout their entire first year. The NHS recommends that first infant formula should always be the first formula given, and unless a midwife, health visitor, or GP suggests otherwise, it is the only formula a baby needs.
Why It Exists if It’s Not Necessary
The answer is largely about advertising rules. Under the International Code of Marketing of Breast-milk Substitutes, which covers infant formulas, follow-on formulas, and any other milk products intended for babies and young children, companies face strict restrictions on how they can promote first infant formula. In many countries, direct advertising of stage 1 formula to consumers is banned or heavily limited. Follow-on milk falls into a slightly different regulatory category, which historically allowed manufacturers more freedom to advertise it. This created a commercial incentive to develop and promote follow-on products, even though the nutritional case for them is weak.
The result is that many parents encounter follow-on milk on shop shelves and in advertisements and assume it is a required next step. It isn’t. It is an option, not a milestone.
What About “Growing-Up” Milk?
Beyond follow-on milk, you may see products labeled “growing-up milk” or “toddler milk,” typically aimed at children aged one to three years. The European Food Safety Authority uses the term “young-child formula” for these products. Unlike infant formula, growing-up milks have no standardized legal composition. Their nutrient content varies widely between brands, and some contain significant amounts of added sugar in the form of sucrose.
Once your child reaches 12 months, pasteurized whole cow’s milk becomes a suitable and much cheaper main drink. The CDC recommends introducing cow’s milk at 12 months (not before) and notes that children aged 12 to 23 months need roughly 1⅔ to 2 cups of dairy per day. Whole cow’s milk provides adequate vitamin D and calcium for toddlers without the added sugars or cost of specialty formulas.
Why Cow’s Milk Isn’t Suitable Before 12 Months
Babies under one year old should not drink regular cow’s milk as a main drink. It contains too many proteins and minerals for a baby’s developing kidneys to handle efficiently, it doesn’t provide the right balance of nutrients a baby needs, and it can increase the risk of intestinal bleeding. This is precisely the gap that both breast milk and infant formula are designed to fill. Follow-on milk occupies an odd middle ground here: it addresses a problem (the unsuitability of cow’s milk for young babies) that first infant formula already solves perfectly well.
Sugar Content Worth Knowing About
One concern with formula products in general is added sugar. A recent analysis of formulas on the US market found that added sugars make up a surprisingly large proportion of carbohydrate content, with standard formulas averaging around 60% added sugars and specialty “gentle” formulas reaching 85%. While this research looked at the broader formula market rather than follow-on milk specifically, it highlights that not all formula products are created equal. Reading labels matters, particularly for follow-on and growing-up milks where composition standards are less tightly regulated than for first infant formula.
Preparing Follow-On Milk Safely
If you do choose to use follow-on milk, preparation and storage rules are the same as for any powdered formula. Powdered formula is not sterile and can harbor harmful bacteria, so the water used to mix it needs to be hot enough to kill germs. Boil fresh water, let it cool for about five minutes (so it’s still around 158°F or 70°C), then add it to the powder.
Once prepared, use the bottle within two hours at room temperature, or refrigerate it immediately and use within 24 hours. If your baby has started a feed, finish or discard the bottle within one hour, because the combination of formula and saliva encourages bacterial growth quickly. Store unopened powder in a cool, dry place indoors. Once opened, keep the lid tightly closed and do not refrigerate the powder itself.
The Bottom Line on Whether You Need It
For most babies, the feeding path is straightforward: breast milk or first infant formula for the first 12 months, with solid foods introduced around six months, then a transition to whole cow’s milk at one year. Follow-on milk is a product you can use during the six-to-twelve-month window, but it fills no nutritional gap that first infant formula leaves open. If your baby is growing well on first formula and progressing with solid foods, there is no evidence-based reason to switch.