Isomil Milk Powder: Guide to Soy-Based Infant Formula

Choosing an infant formula can be difficult, particularly when your baby has digestive symptoms, suspected lactose intolerance or a milk allergy. Isomil milk powder is a soy-protein-based, lactose-free infant formula intended for specific feeding needs.

The reason for changing formula matters. Lactose intolerance, cow's-milk protein allergy and common concerns such as gas, spit-up or fussiness are different problems and may require different approaches.

This guide explains what Isomil contains, when a soy-based infant formula may be considered, how to prepare it safely and when your baby may need medical assessment.

Similac Isomil Soy Infant Formula Powder is a soy-based infant formula made with soy protein isolate rather than cow's-milk protein. The product is lactose-free and is formulated for infant feeding from birth.

The formula contains soy protein isolate along with carbohydrates, vegetable oils, vitamins, minerals and other nutrients used in infant nutrition. Its listed ingredients include hydrolyzed corn starch, soy protein isolate, high-oleic sunflower oil, coconut oil, soy oil and sucrose, along with vitamins, minerals, taurine, L-methionine and L-carnitine.

Isomil contains soy, so it is not appropriate for a baby with a confirmed soy allergy.

Formula ingredients can change between products and markets. Always check the ingredient list on the pack you are using for the most current information.

A soy-based infant formula is not routinely needed by every baby. Healthy full-term infants generally do not need soy formula unless there is a specific reason to use it or a family chooses it after discussing feeding options with a healthcare professional.

A paediatrician may consider a soy-based formula in situations such as:

• Confirmed lactose intolerance
• Temporary lactose malabsorption after some intestinal illnesses
• Galactosaemia, a rare inherited metabolic condition
• Certain situations in which a lactose-free formula is appropriate
• Specific dietary preferences, such as avoiding animal-derived ingredients

True lactose intolerance is uncommon in young infants. Temporary difficulty digesting lactose can occur after some gastrointestinal infections.

A baby who is gassy, fussy or spits up occasionally does not automatically have lactose intolerance. These symptoms are common during infancy and can have many causes.

Soy formula also should not be viewed as a routine treatment for colic or ordinary fussiness. Changing formula repeatedly without identifying an underlying problem may not address the cause of the symptoms.

Lactose intolerance and cow's-milk protein allergy are different conditions.

Lactose intolerance involves difficulty digesting lactose, the natural sugar in milk. Cow's-milk protein allergy is an immune reaction to proteins found in cow's milk.

Because Isomil does not contain cow's-milk protein, a soy formula may be considered in some infants with cow's-milk protein allergy. However, some babies with cow's-milk protein allergy also react to soy protein. An extensively hydrolysed or amino-acid-based formula may therefore be more appropriate in some cases.

If your baby has blood in the stool, repeated vomiting, persistent diarrhoea, poor weight gain, significant eczema or other symptoms that could indicate a food allergy, speak with a paediatrician before changing formula.

Isomil provides protein, fat, carbohydrates, vitamins and minerals in a formulation designed for infant feeding.

Similac Isomil Soy Infant Formula Powder provides approximately 65 kcal, 1.74 g protein, 3.55 g fat and 6.58 g carbohydrate per 100 mL of prepared formula when diluted according to the manufacturer's instructions.

Isomil Nutritional Composition

These values apply to Similac Isomil Soy Infant Formula Powder described in the product information. The nutrition panel on the specific pack you purchase should take precedence if the formulation or labelling changes.

The formula also contains taurine, L-carnitine and L-methionine, along with other vitamins and minerals.

Correct preparation is essential when feeding powdered infant formula. Too much water can dilute the formula's nutritional content, while too little water can make it overly concentrated and may contribute to dehydration.

For Similac Isomil Soy Infant Formula Powder:

1. Wash the feeding bottle, nipple, cap and other utensils thoroughly.
2. After rinsing away soap, boil the feeding utensils for five minutes.
3. In a separate pan, boil the water for five minutes and allow it to cool.
4. Pour the required amount of warm, previously boiled water into the sterilised feeding bottle.
5. Use only the scoop supplied with the Isomil tin and level it as directed.
6. Add one level scoop, approximately 8.7 g, for every 60 mL of water.
7. Mix until the powder has completely dissolved.
8. Check the temperature before feeding your baby.

Never change the powder-to-water ratio. Do not add extra powder to increase calories or extra water to make the formula last longer.

General infant-formula safety also includes washing hands before preparation, keeping preparation surfaces clean and never heating formula in a microwave.

Powdered infant formula is not sterile. Babies younger than 2 months, babies born prematurely and babies with weakened immune systems are at greater risk of serious infection from bacteria that can contaminate powdered formula.

If your baby falls into one of these higher-risk groups, ask your paediatrician about the safest way to prepare powdered formula.

If more than one Isomil feed is prepared in advance, the product instructions state that it should be refrigerated and used within 24 hours.

Once feeding begins, the feed should be used within one hour or discarded.

Do not save formula left in a bottle after your baby has started feeding. Contact with saliva can allow bacteria to multiply.

Once the Isomil tin is opened, the product information states that the contents should be used within three weeks or before the expiry date, whichever comes first. Keep the tin tightly closed in a cool, dry place and do not refrigerate the powder.

Always follow the instructions on your specific pack if they differ.

Isomil is not the right formula for every infant. Speak with your baby's paediatrician before starting it if your baby:

• Has a known or suspected soy allergy
• Has suspected cow's-milk protein allergy
• Was born prematurely or has a low birth weight
• Has poor weight gain
• Has persistent vomiting or diarrhoea
• Has blood in the stool
• Has a diagnosed metabolic condition
• Needs specialised nutritional support

Premature infants may have nutritional requirements that differ from those of full-term infants. Formula choice should therefore be based on their individual medical and nutritional needs.

If your baby has a medical condition or is not gaining weight as expected, the appropriate formula should be selected with a paediatrician rather than through trial and error.

Changing formula can alter the colour, consistency or frequency of your baby's stools. A change in stools alone does not necessarily mean that the formula is unsuitable.

Contact your paediatrician if your baby develops:

• Persistent vomiting
• Ongoing diarrhoea
• Blood in the stool
• Poor feeding
• Poor weight gain
• Significant abdominal swelling
• Persistent discomfort during feeds
• New or worsening skin symptoms

Because Isomil contains soy protein, a baby with soy allergy may develop an allergic reaction.

Seek emergency medical attention if your baby develops difficulty breathing, swelling of the face, lips or tongue, marked weakness, collapse or another sign of a severe allergic reaction.

Do not dilute or concentrate the formula, add cereal or other ingredients to the bottle, or change the feeding plan without medical advice.

If you suspect an adverse reaction to a medicine or healthcare product, contact your healthcare provider or the relevant regulatory authority.

There is no single feeding volume that is appropriate for every baby.

The amount your baby needs depends on factors such as age, weight, growth, feeding pattern and individual nutritional needs. The feeding guide on the Isomil pack can provide a starting point, but your paediatrician can advise you if there are concerns about feeding, growth or weight gain.

Do not increase the concentration of Isomil to make your baby gain weight more quickly. If your baby is not growing as expected, the underlying reason should be assessed.

Likewise, do not force your baby to finish a bottle if they show signs that they are full.

A formula switch may be appropriate when there is a clear medical or dietary reason, but it is best to discuss the change with your paediatrician.

If lactose intolerance has been confirmed, a lactose-free formula may be considered. In some cases, particularly after an intestinal illness, lactose intolerance may be temporary.

If cow's-milk protein allergy is suspected, however, Isomil may not be the best option because some infants with cow's-milk allergy also react to soy protein.

Do not switch formula simply because your baby occasionally has gas, crying or spit-up. These symptoms are common during infancy and do not, by themselves, establish formula intolerance.

If your paediatrician recommends changing formula, follow the preparation and feeding instructions provided for the new product.

The product information for Similac Isomil Soy Infant Formula Powder states that it is formulated for infant feeding from birth and can be used according to the age guidance provided on the product.

However, an age indication does not mean that every newborn should use a soy formula. Formula choice should take into account the baby's health, gestational age, nutritional needs and reason for using a specialised formula.

Breast milk is the recommended source of nutrition for infants when breastfeeding is possible and appropriate. If formula feeding is needed or chosen, your paediatrician can help you select an appropriate product.

The Similac Isomil Soy Infant Formula Powder formulation is identified as vegetarian and uses soy protein as its protein source.

If your family follows specific dietary requirements, check the ingredient information on the exact pack you purchase.

Isomil milk powder is a soy-based, lactose-free infant formula that may be appropriate for selected babies with specific feeding needs, including certain cases of lactose intolerance. It is not a general solution for fussiness, gas or suspected milk allergy.

If your baby has been advised to use Isomil, prepare it exactly as directed, use the correct powder-to-water ratio and follow the recommended storage limits. If your baby has persistent digestive symptoms, poor growth, suspected allergy or another medical concern, speak with a paediatrician before changing the formula.