Similac 360 Total Care is a well-suited formula for newborns. It meets FDA nutritional standards for infant formula, delivers 20 calories per fluid ounce (the standard for newborn feeding), and produced growth comparable to breastfed infants in a clinical trial of 607 babies. It’s one of the few formulas on the market that includes five different human milk oligosaccharides, or HMOs, which are prebiotics naturally found in breast milk that support immune and digestive development.
What Sets This Formula Apart
The headline feature of Similac 360 Total Care is its blend of five HMOs: 2′-fucosyllactose, lacto-N-tetraose, 3-fucosyllactose, 6′-sialyllactose, and 3′-sialyllactose. You don’t need to memorize those names. What matters is that these are prebiotics structurally identical to ones found in breast milk, and they feed the beneficial bacteria in your baby’s gut. Most competing formulas include one or two HMOs. Five is currently the most offered in a single product.
HMOs aren’t digested by your baby directly. Instead, they travel to the lower gut where they promote the growth of healthy bacteria, particularly bifidobacteria, which dominate the intestines of breastfed infants. A healthier gut microbiome in early life is linked to stronger immune function and fewer digestive issues like gas and fussiness. The formula also contains DHA (about 7.7 mg per 100 calories), a fatty acid important for brain and eye development, along with lutein, which supports visual health.
What the Clinical Evidence Shows
A clinical study published by Reverri and colleagues enrolled 607 infants in the United States and followed them through 12 months of age. Babies were fed either Similac 360 Total Care, a formula without HMOs, or breast milk. At six months, there was no significant difference in weight, length, weight-for-length, or head circumference across all three groups. That’s the gold standard result for any infant formula: growth that tracks with breastfed babies.
The same study is the basis for the formula’s five claimed benefits: normal growth, feeding tolerance, immune support, brain development (specifically language and social milestones), and gut health. These were measured across the full 12-month study period, with all groups introduced to complementary foods around six months.
Standard vs. Sensitive Version
Similac 360 Total Care comes in both a standard and a “Sensitive” version. The key difference is the carbohydrate source. The standard version uses lactose as its primary carb, just like breast milk. The Sensitive version swaps out lactose and uses a higher proportion of casein protein. If your newborn is showing signs of lactose sensitivity, like excessive gas, bloating, or loose stools that don’t resolve after the first couple of weeks, the Sensitive version may help. For most newborns, the standard version is the better starting point since lactose is the natural sugar in human milk and supports calcium absorption.
How to Prepare and Store It Safely
Once you’ve mixed a bottle of powder formula, use it within one hour of the start of feeding. Any formula your baby doesn’t finish in that window should be discarded, because bacteria from your baby’s mouth multiply quickly in the warm, nutrient-rich liquid. If you’re preparing bottles in advance, refrigerate them immediately and use within 24 hours for mixed powder.
For the ready-to-feed liquid versions, storage guidelines differ by size. The 32-ounce bottles can be refrigerated for up to 72 hours (3 days) after opening. The smaller 2-ounce and 8-ounce nipple-ready bottles should be refrigerated immediately and used within 48 hours. Never freeze infant formula, as it can separate and change the nutrient distribution.
Past Recall History
Similac 360 Total Care was included in a voluntary recall of certain lots of 2-ounce ready-to-feed liquid bottles. The issue involved a small percentage of bottles that may not have sealed completely, which could lead to spoilage. The recall did not affect powdered formula. If you purchase ready-to-feed bottles, check the lot number against Abbott’s recall list. You can contact Abbott customer service at 1-800-986-8540 with any questions about specific lots.
What to Expect in the First Few Weeks
When starting any formula, give your newborn’s digestive system about one to two weeks to adjust. Some initial gassiness or changes in stool color and consistency are normal and don’t necessarily mean the formula is a poor fit. Newborn stools on Similac 360 Total Care tend to be tan to yellow-green, which is typical for formula-fed babies.
Signs that the formula is working well include steady weight gain (your pediatrician will track this at well-baby visits), six or more wet diapers per day by the end of the first week, and a baby who seems satisfied after feedings. Signs that you may need to try a different formula include persistent vomiting (not just spit-up), blood or mucus in stools, a rash, or a baby who seems consistently uncomfortable during or after feeding beyond the initial adjustment period.
For most healthy, full-term newborns, Similac 360 Total Care provides complete nutrition from birth through 12 months. Its combination of HMO prebiotics, DHA, and iron fortification covers the nutritional bases that matter most during the first year of life.