A recent study found that babies that started eating peanut, wheat, dairy, eggs, fish, and sesame by 3-4 months had a lower rate of food allergies. But it also calls into question whether this protocol would be appropriate or even possible for all babies.
Posts from the ‘Breastfeeding’ Category
There is a persistent myth about infant gut development that comes up in nearly every online discussion of starting solid foods. It’s the myth that infants have a “virgin” or “open” gut until around 6 months of age. I’ve received so many emails, Facebook posts, and comments about the virgin gut over the last few years that I thought it was finally time to take a look at the science – and lack thereof – behind this myth.
I have written before, in my book and on my blog, about the controversy around when to begin introducing solid foods to a baby. Some health organizations recommend 6 months of exclusive breastfeeding, while others recommend starting to offer solids between 4 and 6 months, following baby’s cues of readiness as your ultimate guide. Based on my analysis of the most current science, I believe that the second approach is more evidence-based and helps parents to focus on their baby’s unique development rather than the calendar. I also think that it’s just fine to wait until 6 months if that is your preference.
However, whenever I discuss this science, someone lectures me about infant gut development, and they usually send me a link to KellyMom’s page on the topic, which urges parents not to offer solids before 6 months. Here’s what it says:
“In addition, from birth until somewhere between four and six months of age babies possess what is often referred to as an “open gut.” This means that the spaces between the cells of the small intestines will readily allow intact macromolecules, including whole proteins and pathogens, to pass directly into the bloodstream. This is great for your breastfed baby as it allows beneficial antibodies in breastmilk to pass more directly into baby’s bloodstream, but it also means that large proteins from other foods (which may predispose baby to allergies) and disease-causing pathogens can pass right through, too.”
Wow, that does sound scary! I can see how this “open gut” idea would worry parents approaching the transition to solid foods. But here’s the thing: There are no references given to support these statements, and in all my reading of the research literature on readiness for solids, I have not encountered science backing this concern. Yet somehow this idea of the open gut comes up over and over in online discussions, complete with judgment for parents who offer solids before 6 months and non-evidence-based suggestions about how to “heal” a baby’s gut. All of this only serves to increase anxiety in parents, which is the last thing any of us need.
It’s time to get to the bottom of this. Let’s look at some science…
What do we mean when we talk about an “open” or “closed” gut? How do we measure this? Read more
Health organizations recommend roomsharing without bedsharing as the safest place for babies to sleep. Some parents love roomsharing, but others find it too disruptive to sleep next to a noisy baby. In this post, I look at the science to see how roomsharing affects sleep - both yours and the baby's - and how roomsharing protects infants from SIDS.
When is the best time to introduce your baby to solid foods? I sort through the research to find out.
Readers Brenda and Leah wonder if they need to feed their baby a commercial infant cereal. Here's the answer, in 7 parts, all supported by science.
Two new studies indicate that timing of introduction of gluten and breastfeeding have little impact on the development of celiac disease in high-risk babies.
A study published yesterday in the journal Pediatrics suggests that later introduction of gluten and breastfeeding beyond 12 months both increase the risk of a child developing celiac disease. These new findings add to the already muddy waters of our current understanding of the role of infant feeding in celiac disease.
Celiac disease is an immune response to gluten, a protein found in wheat, barley, and rye. Celiac is characterized by inflammation and damage to the small intestine, leading to symptoms such as diarrhea and digestive pain. In the U.S., celiac disease is present in about 1 in 141 people, although many of these cases go undiagnosed. Infants that develop celiac disease often have poor growth or weight loss, because intestinal damage compromises nutrient absorption. They also may have chronic diarrhea and a swollen, painful belly.
Celiac can usually be treated with a gluten-free diet, but there isn’t a cure for the disease. Multiple genetic markers have been identified for celiac disease, but many genetically susceptible individuals tolerate gluten and never develop symptoms, leading to speculation about other risk factors, including early childhood nutrition.
This latest study was a large, prospective survey of infant feeding practices and development of celiac disease in Norwegian children. Parents were asked when they first introduced gluten and how long they breastfed their babies. Children that developed celiac disease were tracked through Norway’s national medical system. The study included 324 children with diagnosed celiac disease and 81,843 without celiac. The researchers then looked for patterns in the data that might help to explain why some children developed celiac disease and others did not.
There were two major findings to emerge from this study:
- Children that had not yet tried gluten by 6 months of age were more likely to develop celiac disease.
- Breastfeeding at the time of introduction to gluten did NOT appear to be protective. In fact, breastfeeding for longer than 12 months was associated with an increased risk, although it was borderline significant (P=0.046).
Both of these findings are contradictory to current infant feeding advice in the U.S. The AAP’s Section on Breastfeeding recommends exclusive breastfeeding for about 6 months before introducing solid foods, followed by “continuation of breastfeeding for 1 year or longer as mutually desired by mother and infant.” The same AAP policy goes on to say, “There is a reduction of 52% in the risk of developing celiac disease in infants who were breastfed at the time of gluten exposure.” But this Norwegian study effectively found that following the current advice of the AAP seems to increase a baby’s risk of celiac, not decrease it.
Obviously, we need more information here. And as usual, one study isn’t enough to give us the full picture of what we know and don’t know about this topic.
To understand the evolving hypotheses around celiac disease and infant feeding, we need to go back to Sweden in the mid-1980’s, when the rates of celiac disease in young kids suddenly quadrupled from an incidence of 1 in 1000 births to 4 in 1000 births over just a few years. It was an epidemic, and it appeared to be isolated to Sweden; neighboring countries weren’t affected. What’s more, celiac was showing up in really young kids. The median age of diagnosis during the epidemic was just about a year old. In 1995, celiac disease in Sweden plummeted back to pre-epidemic levels, and the median age of diagnosis increased to 4 years of age. Read more
Nothing can prepare you for the changes in your sleep when you welcome a newborn baby into your family. Experienced parents will issue dire warnings and tell you to sleep while you can during the last few weeks of pregnancy. (And you will think, yeah right, there’s a large boulder resting on my bladder, and sometimes it kicks for good measure.)
But then the baby arrives, and your world changes forever. Sleep disruption is one of the most immediate and dramatic changes associated with parenthood. It isn’t just that you’re getting less sleep; it’s that your sleep is suddenly dependent on this baby sleeping. And even though newborns sleep a lot – as much as 16-18 hours per day – it feels disorganized and unpredictable.
The thing is, babies, even brand new ones, actually do have organized sleep, it just isn’t organized like yours. But under the surface, baby is working towards being more like you in his sleep. During the first few months, you have no choice but to go with the flow and sleep when the baby sleeps (something I was never good at), but it can help to understand the inherent patterns in your baby’s sleep/wake cycles so that they become more predictable. Your goal is to work with your baby’s biology, find some time for your own sleep, and support your baby in his natural development towards more mature sleep patterns.
In the research for my book, I’ve buried myself in research papers on infant sleep, trying to glean some knowledge that can be helpful to parents in these first few months of baby’s life. Here’s what I’ve come up with so far:
1. Understand newborn sleep cycles. Newborn sleep alternates between active and quiet sleep (akin to REM and non-REM sleep in adults). During the first few months of life, infants usually begin each sleep period in active sleep. Then, after about 25 minutes, they’ll transition to a cycle of quiet sleep, also about 25 minutes long. During active sleep, babies will twitch and flail their limbs, grunt and sigh, and maybe even cry a little. Their eyes move beneath translucent closed lids and may even open from time to time. In quiet sleep, babies breathe slowly and rhythmically, and their bodies are still 1,2.
Why care about the biology of sleep? Because it can help you in these practical ways:
- Babies wake easily from active sleep, so if your baby falls asleep in your arms, wait until you see signs of that deeper, quiet sleep before you try to move him.
- Around the 45-50 minutes mark, baby will be finishing up that first active/quiet sleep cycle of 45-50 minutes. Transitioning from one cycle to the next can be tricky for a new baby, so if he wakes during this time (particularly if it’s after just one cycle), see if he wants your help returning to sleep before assuming that he’s ready to eat or play.
- Active sleep is noisy. Parents often mistake the normal vocalizations of active sleep as the baby waking, and in their efforts to soothe the baby, they’ll actually wake him up. If you think your baby is waking up, pause and watch him for a moment. He may just be dancing in his sleep, or he might be waking briefly only to return to sleep on his own.
2. Help your baby find a rhythm. We are adapted to Earth’s 24-hour cycle of light and dark, and our physiological circadian rhythms help us to feel awake during the day and sleepy at night. Newborn babies, on the other hand, sleep just as much during the day as they do at night. It takes them some time to develop rhythms to match our day/night cycle. You can help by sending baby strong environmental and social cues about day and night. Read more
You may have heard about a study published in Pediatrics last week (Maguire et al. 2013) showing an association between iron deficiency and breastfeeding beyond a year. If you’re breastfeeding a toddler, or considering it, you might be wondering if you should be worried about iron deficiency. There is very little research on breastfeeding beyond a year in developed countries, so this study is worth a closer look. (If you’re interested, I’ve written before about some of that research, my own reasons for choosing to breastfeed beyond a year, and my experience of weaning my two-year-old.)
What This Study Shows
This was a cross-sectional study of children ages 1-6 in Toronto, Canada. Blood samples were taken from 1647 children, and their mothers were asked, “How long has your child been breastfed?” We always have to be cautious about studies based on parental recall. However, research shows that mothers actually answer this question with good accuracy (Li et al. 2005). Of the children in this study, 93% had been breastfed at all, and median breastfeeding duration was 10 months. Twenty-seven percent of children were breastfed for more than one year, and 4% breastfed for more than two years.
The children’s blood samples were analyzed for serum ferritin and hemoglobin. Serum ferritin reflects the amount of iron stores available for use by the body, so it can be used to assess iron deficiency. If an iron deficient child also had low hemoglobin, he was diagnosed as having iron deficiency anemia. In this study, the prevalence of iron deficiency was about 9%, and 1.5% had iron deficiency anemia, findings similar to other studies in developed countries (Baker et al. 2010, full text here).
This study showed that kids that were breastfed for longer were more likely to be iron-deficient. Each month of breastfeeding beyond baby’s first birthday increased the risk of iron deficiency by about 5%. Children who were breastfed for longer than a year were estimated to have 1.7 times the odds of being iron deficient than those breastfed for less than a year. Read more