Choosing which formula to feed your baby can be baffling and you may feel overwhelmed by the choice. Our guide to formula milks will help you to choose the right type for your baby.

What types of formula milk are there?

There are four different types of formula: 

• cow’s milk-based formula
• goat’s milk-based formula
• hydrolysed protein formula
• soya-based formula

Cow’s milk-based formula

Most baby formula milks are based on modified cow’s milk. You can also get special types of formula manufactured for premature babies. 

Milk can be broken down into two types of protein, which are curds (casein) and whey. Casein is lumpy and whey is watery. The ratio of casein to whey can vary according to the type of baby formula milk. There are two main types: 

• First milks. These milks are based on whey, with a casein:whey ratio of 40:60, which is about the same as breastmilk. They are suitable for your baby from birth up to about a year, and are thought to be easier for your baby to digest than casein-based milks.
• Milk for hungry babies. These milks consist of mostly casein, with a casein:whey ratio of 80:20. Manufacturers claim that the higher casein content means that the milk takes longer to digest, keeping your baby fuller for longer.

However, your baby will only ever need first milk to get all the nutrients she needs. So you don’t need to worry about switching to another milk if you don’t want to.

If you are changing your baby’s milk, be careful to follow the instructions and use the measuring scoop that comes with the new milk. Using too much powder could make your baby constipated. Although many milk manufacturers market their hungry baby milk as suitable from birth, the higher concentration of casein means that a young baby may find the milk hard to digest. It is therefore best to not give this type of formula to a young baby.

If your baby doesn’t seem content with the formula you first started her on, talk to your health visitor before changing formulas.

When your baby’s a year old, you can move her from formula milk to cow’s milk. Cow’s milk is not recommended as a main drink for babies under the age of one because it’s lower in iron and nutrients, such as vitamin E and has too much of some other minerals, such as sodium and potassium . However, you can use small amounts in cooking or preparing food for your baby when she’s six months or older and has started solids. 

Goat’s milk-based formula

Both goat’s milk infant formula and goat’s milk follow-on formula are available to buy in the UK. They are produced to the same nutritional standards as cow’s milk formula. 

Goat’s milk infant formula and follow-on formula is not a suitable alternative to cow’s milk formula for babies with an allergy to the proteins in cow’s milk. This is because the proteins in cow’s and goat’s milk are so similar that a baby with an allergy is likely to react to goat’s milk, too. 

Babies and children with cow’s milk allergy can go in to anaphylaxis after ingesting goat’s milk, so it is best avoided in these circumstances, unless a health professional advises you otherwise. 

When your baby’s a year old, you can move her from goat’s milk formula to goat’s milk. Goat’s milk is not recommended as a main drink for babies under the age of one year old because it’s lower in nutrients and minerals, such as iron. However, you can use small amounts in cooking or preparing food for your baby when she’s six months or older, and has started solids. 

Hydrolysed-protein formula

There are two versions of hydrolysed milk available:

• fully hydrolysed formula
• partially hydrolysed formula

Fully hydrolysed formula is specially designed for babies with an allergy or intolerance to cow’s milk. It is only available by prescription. 

If your baby has a cow’s milk allergy, the protein in the milk will cause an allergic reaction. And if she has an intolerance to cow’s milk, she will have difficulty digesting the sugar, called lactose, in the milk.

Fully hydrolysed formula milks are based on cow’s milk and have the same nutrients as standard formula milk. But the protein in the milk is hydrolysed, which means it is broken down so your baby is less likely to react to it. These milks are also generally lactose-free, so babies with an intolerance to cow’s milk can digest them easily.

If you think your baby has a cow’s milk allergy or intolerance, always see your doctor or health visitor before changing your baby’s milk. If your baby is diagnosed with an allergy to cow’s milk protein, your doctor can prescribe a fully hydrolysed-protein formula. However, if your baby is only intolerant to cow’s milk, your GP may suggest simply buying a lactose-free formula instead. You can buy these over the counter. 

Partially hydrolysed formula

This type of formula milk is made completely from whey protein. It is marketed as being easier to digest, and as suitable for babies suffering from colic, wind, and stomach pain. They are also sometimes promoted as being good for babies with allergies.

However, there’s no firm evidence that this milk is easier to digest. It is also best to not give this milk to a baby with a cow’s milk allergy as not all of the milk proteins in partially hydrolysed milk have been broken down. 

If you think that your baby may have a milk allergy, take her to your GP. 

Soya-based formula

Soya-based formula is made from soya beans. It is modified with vitamins, minerals, and nutrients to make it suitable for formula milk. 

Only give your baby soya-based formula on the advice of your doctor, health visitor, or paediatrician. Even though manufacturers market their soya formulas as suitable for babies from birth, health professionals don’t recommend them for babies under six months. 

Soya formula is also not recommended if your baby has a cow’s milk allergy. Up to six in ten babies who are sensitive to cow’s milk are also sensitive to soya, too. 

If you decide to move your baby on to soya milk once she is six months old, make sure that you take extra care with her growing teeth. Soya formula milks can damage your baby’s teeth over time, because they are often sweetened with glucose syrup. 

Read more about taking care of your baby’s teeth.

What kind of formula milk does my older baby need?

Some formula milk is marketed for babies from six months old because it is higher in iron, which growing babies need. However, these milks are not nutritionally necessary as they offer no real advantages over standard formula milks. 

Your baby will still get iron and other nutrients she needs from her normal formula, which you can then top up with solid foods. If your baby is happy with her usual formula, there is no need to switch. 

Milks marketed for older babies include:

Follow-on milks

These are milks with higher protein and mineral content than ordinary infant formula. They are sold as suitable for babies from six months old. Follow-on milks are advertised as more nutritious than cow’s milk because they contain added iron, vitamins and minerals. 

However, research has found no clear benefit for babies. Comparisons with cow’s milk are also misleading, as cow’s milk is not recommended as a drink for babies under one year old. 

Goodnight milks

These are follow-on milks with added cereal, which are marketed as helping babies to sleep better at night. However, there’s no evidence that they help babies to settle at night or that they take longer to digest.

If your baby is under six months old, don’t give goodnight milk to her. This is because cereal isn’t suitable for younger babies. It’s also best not to offer your baby this milk if she has a tendency to be a bit overweight.

Growing-up milks

Growing-up milks are marketed at parents as being better than cow’s milk because they contain added iron and other vitamins and minerals. They are promoted to be used for babies from about one year old. 

But if your baby is healthy, growing-up milk isn’t needed. Once your baby’s a year old she can have full-fat cow’s milk as her main drink, along with a variety of solid foods. This should provide her with all the essential vitamins and minerals she needs. 

However, it’s easy for small children to miss out on important nutrients as they get used to eating regular meals. The Department of Health therefore recommends that all children aged between six months and five years are given a supplement. The supplement comes in the form of drops, containing vitamins A, C and D. You may be entitled to free drops under the Healthy Start Scheme. 

If your child is having vitamin drops and eating well, she won’t need growing up milk. Although growing up milks have added nutrients, they are also high in sugar. This could damage your child’s teeth and her health in the long-term. If you are unsure about feeding supplements or growing up milk, speak to your GP.

What’s the cost and preparation time of formula milk?

Formula milk does take time to prepare. Depending on the sterilisingmethod and the type of formula you use, making up one bottle could take around 30 minutes to 40 minutes. So if you give your baby six bottles a day, and prepare each one at the time, you could spend up to four hours a day preparing your baby’s formula feeds. 

Most formula milks are sold as dry milk powder, packaged in tins. You make up the formula by adding scoops of the dried milk powder to boiled water that has been left to cool slightly. 
Some brands are available in pre-measured sachets that contain the right amount of formula for one feed. These can be a bit pricier, but they are useful when you’re travelling or when you want to make sure a feed is made up accurately. You can also buy ready-made formula milk, which is more expensive, but very handy for when you’re out for the day or on holiday. 

Prices vary by brand, type, and retailer, but start at about £8 for a 900g tin of powdered cow’s milk-based formula milk. You generally pay about the same for soya-based infant formulas and lactose-free formulas. Goat’s milk formula costs more. Hydrolysed-protein formula also costs more, although you can get fully hydrolysed formula on prescription if your baby has a cow’s milk intolerance or allergy.