How to Change Formula for Baby? Tips for Singaporean Parents

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Sometimes, parents may need or choose to switch their little one’s formula, and this transition must be handled carefully. But how to change formula milk for babies without causing any side effects?

The answer lies in our list of practical tips for new parents. It covers the signs that suggest it might be time for a switch, how to make the transition smooth, and the possible side effects of changing newborn formula to watch out for.

When To Change Formula Milk for Baby

Breastfeeding provides the optimal nutrition for your baby with essential nutrients and antibodies. However, when breastfeeding isn’t an option, formula milk is a safe and reliable alternative. Some parents also choose to combine both methods through mixing breast milk with formula, which can provide flexibility while maintaining some breastfeeding benefits.

Once you’ve selected a formula for your baby, it’s generally best to stick with it unless you have a reason to switch. There are different reasons for switching formula, such as the baby’s age, developmental stage, or the current formula may no longer suit their digestive system.

Before you switch, browse our formula range by stage to compare age-appropriate options and choose the best fit for your baby’s current needs.

There’s no specific time or age when you must change your baby’s formula, but certain signs can indicate it might be necessary. Symptoms of formula intolerance include but are not limited to:

• Excessive Spit-Up: It’s normal for babies to spit up (around 6 ounces per week) as their digestive systems develop. However, if your baby spits up more than two tablespoons at each feeding, it could signal a formula intolerance ^[1].
• Slow Weight Gain: Babies typically gain about 30g per day until three months old, and then about 20g per day between 3 and 6 months ^[2]. If your baby isn’t gaining weight as expected, the reason might be formula intolerance.
• Bloody Stool: Blood in your baby’s diaper is a bad sign. While there are several possible causes, all of which require medical attention, one potential cause is a milk allergy.
• Severe Constipation: Formula-fed babies generally have at least one bowel movement a day. If your baby is straining, passing hard, small stools, or experiencing stomach cramps, they may be constipated. Switching formulas may help, but ensure that you do not switch to a low-iron formula, as infants need iron for healthy growth, and the amount in standard formulas typically doesn’t cause constipation.
• Allergy Symptoms: Around 2% to 3% of babies develop a milk allergy within their first few months, though most outgrow it. Symptoms can appear immediately after feeding or up to 10 days later, including eczema or skin rashes, vomiting, gagging, fussiness, etc ^[3].

Always seek advice from healthcare specialists before changing formula milk brands or types. Since every baby is different, take time to observe your little one’s behaviours and cues to determine which formula works best for them.

The next section reveals how to change baby formula smoothly and ensure your little one can adapt to new meals without hassle.

Changing Baby Formula Because of Gas

Many parents consider gas to be the main reason for fussiness, but it’s only one of many possibilities. A little spit-up or gas is common and doesn’t necessarily mean you need to change formulas.

Pediatric dietitian Andrea Adler, RD, CSP, CSPCC, LD, explains, “All babies have some vomiting. Many are what I call ‘happy spitters’—they spit up a bit, but it’s not forceful.” She adds, “If your child is gaining weight and growing well, it’s usually no big deal—just a little extra laundry.”^[4]

It’s usually fine to let it be if your baby’s fussiness doesn’t last long or impact their growth, pooping habits (without blood), happiness, or sleep. However, talk to your pediatrician and consider switching formula if you notice:

• Large amounts of spit-up after feedings
• Fussiness and crying after meals
• Projectile vomiting
• Blood in stool
• Lack of weight gain (use this chart to keep track of your baby’s weight)

Alternate Between Existing and New Formula

When transitioning to a new formula, a gradual approach can ease the adjustment for your baby and help you monitor any changes in their reaction to the new formula.

Begin by mixing a small amount of the new formula with your baby’s current formula. This helps your baby become familiar with the taste and composition of the new formula without overwhelming their digestive system.

Over the course of the 2 weeks, gradually increase the proportion of the new formula while decreasing the amount of the existing formula. Here is a slow-transitioning chart recommended by SMA Nutrition UK and Ireland for you to consider:

You might start with a 20% new formula and 80% old formula, and then gradually shift to 80% new formula and 20% old formula before making the full switch.

Pay close attention to how your baby reacts to the new formula during this transition. Watch for any indications of discomfort or adverse reactions, such as:

• Changes in stool patterns
• Excessive spit-up
• Fussiness

Adjust the transition pace if needed, giving your baby more time to adapt if any issues arise.

Transition Morning Feed First

Experts recommend starting the changeover with a morning feed when introducing a new formula. This approach allows you to watch your baby for any potential reactions or symptoms throughout the day. By making the change during daylight hours, you can keep a close eye on how your baby responds.

Give Your Baby Time to Adapt

Each baby has a different reaction when changing formula milk, so be patient and wait for your baby to adapt. If your baby has any signs of discomfort, such as excessive fussiness, gassiness, or changes in stool consistency, consider slowing down the transition process.

Instead of moving quickly, reduce the amount of new formula you’re introducing and allow more time for their digestive system to adapt.

The transition can take up to 2 weeks, and some babies may require the full duration to fully tolerate the new formula ^[5]. Taking a step back is perfectly fine if you notice your baby isn’t adjusting well. If symptoms persist or worsen, talk with your pediatrician for further advice.

What May Happen When Changing Formula Milk

Most babies will gradually adjust to a new formula, but it’s not uncommon for some to be a bit hesitant. If your baby turns their head away or refuses the bottle, it may simply mean they are still getting used to the new flavour.

However, there are cases where a baby may not tolerate the new formula. If you observe any of the following signs, stop offering the formula and consult your healthcare provider immediately:

• Heightened fussiness during feedings
• Diarrhea
• Blood or mucus in stools
• Vomiting
• Signs of discomfort (e.g., pulling legs up toward the abdomen while crying)
• Weight fluctuation
• Changing their bedtime
• Skin rashes

Remember, changing baby formula is not always a smooth process and can sometimes lead to unintended consequences. While this guide provides helpful tips to help make the transition easier, you should always talk to your healthcare professional to ensure that the new formula meets your baby’s specific needs.

Breast milk is the ideal nutrition for babies, and it’s crucial to seek professional advice before using infant formula. Introducing bottle feeding can impact breastfeeding, so consider carefully. Besides, good maternal nutrition is critical for breast feeding, and reversing the decision not to breast feed may be challenging. Infant formula should always be used according to instructions to ensure the infant’s health. Social and financial implications should be considered when determining a method of feeding.