Infant Formula vs. Follow-On Formula: What’s the Difference and Does Your Baby Need Stage 2?

What Is Infant Formula (Stage 1)?

Infant formula, also known as Stage 1 formula, is designed to meet all the nutritional needs of healthy babies from birth up to 12 months of age.

All Stage 1 formulas are nutritionally complete for the first year. However, many brands also offer a follow-on (Stage 2) formula and may recommend switching from around 6 months.

What Is Follow-On Formula (Stage 2)?

Follow-on formula (Stage 2) is designed for babies aged 6–12 months.

It’s usually very similar to the same brand’s Stage 1 formula, with only small differences in nutrients or ingredients. If you’re considering switching, compare the nutrition panel and ingredient list to see what has changed.

Not all brands make a Stage 2 formula. Some parents assume these products always contain more iron or added nutrients, but this isn’t required by regulations—though many brands do add more iron, as older infants need higher amounts. Always check the label for the details that matter most to you before deciding.

Do You Need to Switch to Follow-On Formula at 6 Months?

Brands make small adjustments to their follow-on formula to better suit babies aged 6–12 months and may encourage parents to switch. However, there’s no nutritional requirement to do so. For most babies, continuing with Stage 1 formula until 12 months is perfectly fine—it’s your choice.

What are the actual differences required by the regulations?

The regulations set out over 100 detailed requirements, including minimum and maximum nutrient levels. This means a formula’s composition can vary within a range that is considered safe and nutritionally adequate for babies.

For those interested, we’ve included a technical summary of the regulatory differences between infant formula and follow-on formula in Australia and New Zealand. These differences are relatively small and mainly relate to the a small difference in the required nutrient ranges.

Can I Feed Stage 2 Formula to a Baby Under 6 Months?

This question often arises if a Stage 2 product is purchased by mistake or if Stage 1 is out of stock.

The regulations for Stage 1 and Stage 2 formula are the same in most areas, with over 100 detailed requirements. While there are some small differences, the two products can even be identical in composition and compliant to the regulations.

While it may not be ideal, using Stage 2 formula is generally safe—especially if your baby is healthy and close to 6 months. If you’re unsure, the simplest and best option is to check with the product’s customer service team or your healthcare provider.