Formula Feeding 101
Mama, before we talk bottles and water temperatures, can we just pause and say - we’re so proud of you.
Whether formula feeding was your first choice or a path you found along the way, you’re making sure your baby is fed, loved, and thriving. That’s what matters most. There’s no one “right” way to feed your baby. Only the way that works best for you and your little one.
Formula Preparation
The very first step: always read the instructions on your specific formula container. Each brand may vary a bit, and those details matter!
A few important reminders:
You don’t have to warm formula before feeding — room temperature is perfectly fine. If your baby prefers it warm, just make sure it’s gently warmed (not hot) and never microwaved.
Use safe water. If you’re unsure about your tap water, reach out to your local health department. In some cases, you may need to boil the water for one minute, then let it cool before mixing.
Always measure carefully.
Measure the water first, then add the powder.
Too much water can mean your baby isn’t getting enough nutrients.
Too little water can make the formula too concentrated — which is hard on your baby’s kidneys and tummy.
Bottled water is also safe for mixing powdered formula if you prefer that option.
A few extra minutes of care here go a long way in keeping your baby safe and nourished.
Formula Storage
Once formula is prepared, it can spoil if left out too long, and we all know how easy it is to lose track of time when juggling baby life!
Here’s what to remember:
Use prepared formula within 2 hours of mixing it.
Once you start feeding, use it within 1 hour.
If you haven’t used the formula within 2 hours, refrigerate it right away and use it within 24 hours.
Throw out any leftover formula in the bottle after a feeding. (We know it feels wasteful, but once baby’s saliva touches the milk, bacteria can grow quickly.)
Clean and sanitize bottles and nipples before using them again.
Store unopened formula containers in a cool, dry place (between 50–86°F).
Most formulas need to be used within one month of opening (check your label to be sure).
And don’t forget to check that “use by” date on the container!
A Few Common Questions
1. Do I have to boil water every time?
Not necessarily! If your tap water is safe, you can use it as is. Boiling is only needed if your water source might be contaminated or if you’re preparing formula for a very young or medically fragile baby.
2. Can I mix a batch ahead of time?
Yes! You can prepare multiple bottles and store them in the fridge for up to 24 hours (just label them with the time and date).
3. Can I heat formula?
Yes, you can heat formula that has been refrigerated, but only if it hasn't been fed to the baby yet. Do not reheat it after the baby has finished the bottle, and never use a microwave to warm formula because it can create dangerous hot spots.
4. What’s the best way to travel with formula?
Bring pre-measured formula powder in a clean container and bottled water for mixing when needed. Or, pack pre-made ready-to-feed bottles in a cooler bag with ice packs!
You’re Doing Great, Mama!
There’s no one “perfect” feeding journey - there’s just your journey, and it’s beautiful. Formula feeding doesn’t make you less of a mom. It makes you a mom who’s feeding, loving, and caring for her baby in the way that works best for your family.
Every bottle you prepare is an act of love.
From all of us at Choose Joy Nursing - we see you, we’re proud of you, and we’re cheering you on every step of the way!
For more information and guidelines on infant formula preparation and storage, please visit the CDC website.
