What is calcium and why is it important
Let’s start with the basics: calcium is one of those behind-the-scenes nutrients that doesn’t get much hype, but it’s doing a ton of essential work for our body. Most people think of calcium as “the bone stuff,” and that’s true; it’s a major building block for strong bones and teeth. But calcium also helps your muscles move, your nerves send signals, and your heart to beat normally. In other words, it’s not just about skeletons. It’s about keeping the whole system running smoothly.
For babies and kids, calcium is especially important because their bodies are growing at warp speed. They’re literally building bones from scratch, and that early foundation matters for the rest of their lives. Getting enough calcium in infancy and childhood helps support healthy growth now and stronger bones later on. The reassuring part? Nature and modern nutrition make this pretty doable. Breast milk and formula are designed to meet babies’ needs early on, and as kids grow and their diets expand, calcium just becomes one more important piece of the overall nutrition puzzle.
Calcium Needs for infants
The calcium requirement for 0-6 month olds is 200 mg/day; for 6-12 month olds it bumps up slightly to 260 mg/day.
Very little thought or effort is needed to make sure they get enough at those ages. Babies who are growing well and feeding within the normal range will have no trouble getting their calcium needs met. The calcium in breast milk is quite ‘bioavailable’ meaning that it absorbs very well. Formula also has enough calcium to meet these needs.
A note on Cow’s Milk Protein Allergy
A small subset of babies will show signs of a cow’s milk protein allergy in the first few months of life, often around 2–4 months, but sometimes even earlier. This can look like persistent fussiness or pain with feeds, lots of spit-up or vomiting, blood or mucus in the stool, eczema or rashes, and sometimes poor weight gain. For breastfed babies, symptoms can still show up because tiny amounts of cow’s milk protein can pass through breast milk if a parent is consuming dairy; for formula-fed babies, it may become obvious soon after starting a standard cow’s-milk–based formula. If you’re seeing these patterns, it’s worth flagging for your pediatrician so you can make a plan together.
The really reassuring news - most babies with cow’s milk protein allergy outgrow it. The vast majority tolerate dairy again by late infancy or toddlerhood as their gut and immune system mature. In the meantime, there are great options (like hypoallergenic formulas or temporary dairy elimination) that keep babies comfortable and growing. This is one of those early-baby bumps in the road that feels huge in the moment, but for most families, it’s temporary.
4-7 months
At this age milk is still key. Until your little one is 6 months old, the only thing they technically really need is milk. Offering solids at this age is just for fun and exploration. The exception is a situation when allergens are recommended for some infants before 6 months due to risk of allergies. If you have more questions about solid foods, we did a huge post about this last year.
While it is fine to carefully introduce milk-based products such as cheese or yogurt to your children once they are over 6 months, cow’s milk lacks the correct balance of nutrients to be an appropriate substitute for formula or breast milk for kids under a year. To emphasize: limited cow’s milk products are fine, it just shouldn’t be the main nutritional source at this age.
When you do offer dairy products for the first time, watch carefully to make sure they don’t have any reactions (such as diarrhea or hives).
From 7-12 months ideally your baby has a mix of milk (breastmilk or formula) plus solids
We recognize that many parents stress about the exact balance of milk and food. The truth is, while milk is much more important for the first six months, at this age, there are no exact ratio requirements between milk and solids. Some kids are so excited by real food and others still prefer their milk. Your job is to offer both.
There are some simple common sense strategies.
Does your little one strongly prefer milk? Offer some solids first, before they fill up on the milk.
Are they only interested in solids? Offer the milk first.
But don’t let this drive you too crazy. As long as the baby is happy, growing, sleeping, pooping and peeing you can likely trust them. If your baby isn’t growing well then at that point it is worth checking in with your pediatrician to make a firm plan.
Blink and they are a year old! Calcium recruitment jumps up from 260 mg to 700 mg/day. At this age it is fine to expand your milk options.
Here are a few common questions and talking points
Are you still nursing? Great! There is nothing like breastmilk. Don’t be in a rush to stop. For those moms who are able to continue to breastfeed beyond the first year, that magical breast milk feels like a godsend if your child doesn’t feel well. Not only is nursing a comfort, but breastmilk is great for tummy bugs, eye issues and all sorts of stuff.
Do you have a huge stash of formula left over?
Great! Feel free to use it up. The only downside to formula at this age is the expense.
Do you need a toddler formula? We don’t think so. Toddler formulas are designed to help bridge the gap between infant formula and regular milk. We have never really seen the need for this step and many kids get constipated from some of the brands. If you do opt to go in that direction, make sure you keep an eye on the poops.
Dairy Milk Choices and Considerations
A lot of parents ask us, at one-year-old, “ok, so now that they’re one we have to switch to regular cow’s milk, right?”
Wrong.
Humans didn’t evolve a dependence on the bovine species. We have a need for calcium, vitamin D, fats and proteins. Whole fat cow’s milk just so happens to be an easy way to get those things, but it’s not the only way. Some kids skip milk altogether in favor of cheese and yogurt, or vegan options, and that’s fine.
Most kids who were on a milk-based formula have no trouble moving on to cow’s milk. It is fine to do it gradually so that they get used to the taste (add a few ounces to the formula and see how they do). Intolerance will likely show up as tummy aches, poop changes or rashes. Nurse Judy’s older daughter got a terrible flare up of eczema when she first switched her over to cow’s milk. They put her back on her formula for a couple of months and when they tried the milk again, she seemed to tolerate it just fine. We don’t have any clinical understanding for why this happened, but we have seen it happen with other patients over the years.
Do you need to offer whole milk?
This society is so conditioned to think that fat is bad, but your child actually needs all of that fat for their brain development. But if they are getting fat from other sources like full fat yogurt and cheese, it is fine to compromise and do 2% so that your fridge isn’t overrun with so many milk options.
The AAP has historically suggested moving all kids to reduced fat milk at 2 years, but this isn’t a hard and fast rule and can be assessed based on your child’s growth and needs.
Do you need to spring for Organic?
Our bias leans toward organic (we are skeptical of the hormones and antibiotics in non-organic milks), but there’s no good consistent evidence that organic milk leads to better health outcomes for kids.
What about raw milk?
Big NO From Us
Here, the studies are clear. Raw milk comes along with health risks. We would avoid it. The purported health benefits have not been consistently shown, they are theoretical and not worth the risk of E. Coli and Listeria.
Vat pasteurization seems to be safe.
What on earth is A2 Milk?
If you thought that the main choices about cow’s milk were organic or fat content, think again. Along comes the choice between A1 and A2. Huh???
It turns out that there are indeed two kinds of cows out there (don’t worry, there won’t be a test on the following paragraph). A1 and A2 beta-casein are genetic variants of the beta-casein milk protein. The A1 beta-casein type is the most common type found in cow’s milk in Europe (excluding France), the USA, Australia and New Zealand. This is what most of us have grown up drinking. African and Asian cows are predominantly A2 cows. Milk from goats and humans contains only the A2 beta-casein.
There was a lot of buzz about this when we first wrote this post several years ago. The claim is that folks who have trouble with our common (A1) milk may in fact be able to tolerate A2 milk without any issues. Nurse Judy rolled her eyes when it first came around, but she confessed that she has had some patients with milk intolerance who seem to do better on the A2 milk. In the past years, A2 milk has become more widely available at many grocery stores and doesn’t seem to be all that more expensive. For those of you with milk issues, it is worth checking out. https://www.a2milk.com/our-
Non dairy milk alternatives
The array of plant based dairy alternatives has exploded over the last several years. Although the dairy industry did some grumbling about sharing the name, the FDA ruled that they are indeed allowed to call themselves milk. Fortunately, they are simultaneously mandated clearer labeling.
Below is a good guide to some of the popular options out there. There are big variations among the choices and these numbers vary by brand. If you decide to skip cow’s milk altogether, you won’t get a lecture from us as long as you are paying attention to the nutritional components. The key is making sure that your kids are getting adequate amounts of protein and calcium.
As you are reading those labels, watch out to make sure you aren’t getting a sweetened version that is adding all sorts of extra sugar.
Lets dive a little deeper into some of the nutritional considerations
Protein:
It is important to note that not all proteins are created equal.
Cows milk contains essential amino acids – the “building blocks” of protein – that our bodies need.
Except for soy milk, the protein in most nut or plant-based milk substitutes is incomplete, meaning it’s lacking in some of these essential amino acids. Since your body can’t produce essential amino acids on its own, it has to come from the choices you make in your daily diet - like dairy or soy milk. If you have a hard time getting your children to drink milk, it is important to make sure they are meeting those nutritional needs through other sources.
If you choose to use a milk alternative such as goat, soy, rice, almond, coconut or pea protein, read the labels and see how they compare.
Vitamin D
After age 1, kids need 600 IU of Vitamin D per day. In general: having the milk fortified with vitamin D is a bonus, but many kids either need a multivitamin supplement or a lot of high vitamin D foods. Milk fortified with vitamin D has 100-150 IU per cup, so if you’re sticking to 3 cups of milk per day as a maximum (see above) you’re only getting 300-450 IU daily. The rest needs to come from elsewhere. The best source is a bit of sunshine, but that comes with its own risks. The Vitamin D Post here has a chart with the amount of vitamin D from different foods.
Keep in mind that calcium absorbs better with Vitamin D so if you chose to supplement with vitamins try to take them together.
Iron and Milk
Iron isn’t something that you are going to be getting from most milk sources, but it is so important that we want to include some considerations in this post.
Cow’s milk does not have as much iron as formula, so it is important to make sure your little one is getting iron from other sources. In fact, as we discuss below, cow’s milk is notorious for actually blocking the absorption of iron. Iron is such an important but tricky nutrient. It absorbs much better with high vitamin C foods. Take a moment to review the Iron Post from several years ago.
If your little one is a picky eater, some physicians like to see a blood test result showing that the baby has an adequate hemoglobin level( a proxy for iron) before leaving the formula behind.
Is there such a thing as too much milk?
It is not uncommon for our little patients who are ‘milkaholics’ to be anemic. Due to its high casein and calcium content, excessive cow’s milk can block the absorption of the iron in the gut. This is even more of an issue for a vegetarian diet. At the same time, kids who fill up on milk instead of eating other foods with wider nutritious content can become even more anemic. This is why, with your toddlers, ideally keep milk intake under 24 ounces per day.
One more reason to pay attention to this? Anemic kids often have sleep issues. Cutting back on the milk can be an easy fix.
Dr. Ted’s Tidbit
The 24 oz per day milk limit is a tough concept. Every gut is different, and kids have wildly different needs based on their diet. What’s with all the fuss?
To add some scare to your milk motivation: I’ve seen milk-induced anemia in action. I’ve had patients that have wound up in the pediatric ICU with dangerously low hemoglobins that needed blood transfusions. Why does this happen?
In the child that I’m thinking of, they subsisted on essentially only milk (far over 36 oz per day), every day, with very little other food sources, except bread. There are a couple of theories as to why this happens. It’s known that cow’s milk can lead to increased intestinal blood loss (we all bleed a little into our guts, milk just makes us do it more). That blood takes iron with it. At the same time, studies have shown that unmodified casein protein in cow’s milk, as well as calcium, have the potential to bind with iron and limit its absorption, but mostly for none-heme iron (aka iron that’s not from meats or animals).
There’s still some ambiguity in these guidelines, but use the above science to direct how you approach nutrition. If you have a total milkaholic, the occasional 30oz day is ok if you pair it with hamburger meat. If you have a picky carb-atarian who skips meat, it might make sense to stick to the 24oz or under guidelines.
From Bottle to Cup
We personally don’t feel the need to be completely off of the bottle at 12 months. Until 18 months or so, we are perfectly fine with a snuggle bottle when first waking up or going to sleep.
But please keep this important rule:
NEVER leave a bottle of anything other than water in bed. If a child falls asleep and keeps the milk bottle in their mouth it will risk tooth decay.
After a year, try to transition most of the fluid intake to a cup. Once you start moving away from the bottle and transitioning to a cup you may find that your child doesn’t take in nearly as much milk. We couldn’t tell you why, but we have seen it over and over again. Milk in a cup just isn’t as comforting.
Some parents like to hold on to that bottle option just to make sure that their kids are getting at least some milk every day. In any case, once you lose the reliable amounts of milk that you used to count on from the bottle, it becomes even more important to pay attention to other sources of calcium.
If your little one is two and has managed to convince you that the bottle is essential, it is time for an intervention. It is time for that bottle to disappear. Consider making a big production about “gifting” all of your bottles to someone else’s baby. At the same time go out and pick out a special ‘big kid’ cup.
Sippy cups are not the best option. Straw cups are preferred.
Extra little tricks
If you are trying to encourage your child to drink the milk from a cup:
Try adding a few drops of vanilla.
Experiment with the temperature. Some kids might like it better warm.
You can also try frothing it.
Consider making smoothies with milk as the base. Kids like adding things into and turning on the blender.
What about Calcium Supplements? Tums?
For most adults, the goal is to meet calcium needs through food first, with supplements used only to fill in the gaps if diet falls short. If you do supplement, smaller doses (like 500mg - 600mg per dose) work better than one big dose, and pairing calcium with enough vitamin D helps with absorption.
Specifically, we recommend against the regular use of Tums for calcium supplementation. While Tums does have calcium in it, it also suppresses stomach acid. If done regularly, it can cause rebound acid production in the stomach (ouch).
With a little planning, getting enough calcium should be reasonably easy.
Reference Section
High-Calcium Foods (per typical serving)
Note the spike during the growing years. If you have a teenage boy who seems to need a new pair of pants every 3 weeks, this will make perfect sense to you.










