The infant feeding schedule:
Why--breast or bottle--babies benefit from being fed "on demand"
© 2008 - 2014 Gwen Dewar, Ph.D., all rights reserved
What’s the best infant feeding schedule?
generations, Western “baby experts” have advised parents to feed their
babies at regularly-spaced intervals of 3- or 4-hours. Today, official
medical recommendations have shifted in favor of feeding on demand.
probably a good thing, because the timed-interval infant feeding
schedule is not dictated by physiology or what’s best for babies.
Research suggests that many babies are better off if they are permitted to regulate their own feeding bouts. In fact, as I note below, it's even possible that scheduled feeding -- for breastfed and bottle-fed babies alike -- has a negative impact on cognitive development (Iacovou and Sevilla 2013).
parents don’t always get this message. The time-interval infant feeding
schedule has become culturally entrenched, and some hospitals
have been slow to adopt the sorts of practices--like rooming in--that
promote feeding on demand (e.g., Kersting and Dulon 2001).
This article reviews the evolutionary, cross-cultural, and medical evidence in favor of frequent, baby-initiated feedings. As noted below,
the evidence supports the following conclusions:
- New mothers are more likely to establish an adequate milk supply if they breastfeed frequently and on demand
should be fed frequently and whenever they show signs of hunger—ideally, before they begin to cry
- It's a good idea to let the baby's interest--not the clock--determine when a breastfeeding session is over.
- "On demand" infant feeding schedules permit babies to adjust their
intake in response to natural variations in breast milk quantity and quality
- Infants breastfed on demand may benefit from higher quality breast milk and fewer digestive problems
- Infants (of any age) breastfed on demand may experience less stress and pain
- Infants fed on demand may take more naps
- Moreover, women who breastfeed their newborns on demand are more likely to continue breastfeeding after 1 month.
these reasons, both the World Health Organization (WHO) and the
American Academy of Pediatrics (APP) now recommends that breastfeeding
mothers follow a baby-initiated infant feeding schedule.
Formula and the infant feeding schedule
about formula feeding? There is growing concern among some researchers
that babies who feed from bottles may be at increased risk for overfeeding.
For example, in one study of 1250 American infants, researchers found that bottle-feeding in early infancy was associated with a tendency to eat everything on offer. The more frequently babies drank from bottles during the first 6 months, the more likely they were in later months to drink everything from a bottle or cup given to them (Li et al 2010).
A smaller study conducted in the United Kingdom reports similar results (Brown and Lee 2012), and keep in mind -- the results were the same for both formula-fed babies and babies who consumed breast milk. It was the bottle, not the specific contents of the bottle, that seemed to matter.
It's not yet clear what this means. Infants can extract milk more quickly from a bottle than they can from a breast. Perhaps the fast pace leads to consuming more during a feed, and babies being accustomed to taking in bigger meals.
This might sound like an argument against feeding such babies on demand. Left to their own devices, won't they consume too much?
But studies suggest that both breastfed (Woolridge and
Baum 1992) and formula-fed (Fomon et al 1975) infants adjust their
intakes in response to changes in the calorie content of their milk or
formula, consuming less when meals are rich.
Given this, and the apparent benefits of feeding babies on cue (see below), it seems prudent for parents of formula-fed babies to
begin by feeding on demand, and then consult
with their pediatricians about their babies' weight gain over time.
The infant feeding schedule in evolutionary perspective
Mammals are named for their milk-secreting mammary glands, and mammal
babies everywhere begin life on a diet of milk. But not all milk is
alike, and different species follow different infant feeding schedules.
the world of mammalian infant care, and you’ll discover two major
feeding strategies: the spaced feeders and the continual feeders.
feeders “park” or "cache" their young in nests and leave them
there—unattended—for hours at time. Mom uses her time away to forage.
The kids must wait for long intervals between feedings. But they don’t
go hungry: Spaced feeders have evolved high-fat, high-protein milk. And
the babies are designed to suck fast and furious when they get the
A good example of a spaced feeder is the rabbit, which produces milk that is 18.3% fat and 13.9% protein (Jenness 1974).
contrast, continual feeders stay with their babies at all times.
Whether they follow their moms around on foot (like cows) or get carried
(like monkeys), kids stay in close contact with Mom. They get fed more
frequently than spaced feeders do, and they tend to initiate feedings.
Consistent with their high-frequency infant feeding schedule, they suck
at a more leisurely rate. Their milk is less caloric, more dilute. Cow
milk is typically 3.7% fat and 3.4% protein (Jenness 1974).
So what about humans?
In some modern industrial societies, humans act like spaced feeders.
Babies are “parked” in cribs or cradles and get fed after intervals of
3-4 hours. But were we designed for this strategy? The answer is no.
belong to the order Primates, a group that includes prosimians, monkeys
and apes. A few—mostly nocturnal, prosimian species—are spaced feeders
(Teilden and Oftedal 1997).
But most—including our closest living relatives, the gorillas, chimpanzees, and bonobos—-are continual feeders.
the proof is in our milk: Compared to the milk of spaced feeders, human
milk is relatively low in fat (3.8%) and protein (1%), and human
infants suck slowly when they feed.
So the composition of our
milk gives us away. We’re meant to be continual feeders. (Click here for
a more detailed account of the
nutrients and calories in human breast milk.)
But though human milk is comparatively dilute, this doesn’t mean that human milk is everywhere and always the same.
milk composition may vary significantly among individual women, and the
same woman may experience significant fluctuations in her milk quality
And--most interesting for our discussion here--that fat content of human milk increases when babies feed more frequently.
Human milk quality improves with frequent feedings...and volume of intake
International studies show that the more frequently a woman
breastfeeds, the higher the fat content of her milk (Prentice and
Prentice 1988; Prentice et al 1981; Jackson et al 1988; Daly et al
Other factors associated with higher fat content include
the volume of intake at previous feed (how much milk the baby ingested
at the last feeding) and volume of intake at the current feed (Woolridge
Volume of intake is important because the highest fat milk comes from soft, apparently empty breasts.
a baby begins feeding from a full breast, the milk she receives
(“foremilk”) is relatively low in fat. Fat content increases as the
For this reason, it’s important not to force babies to switch breasts before they’ve had their fill. Premature switching can rob the baby of the higher-fat hindmilk associated with the latter part of a feed (Woolridge and Fisher 1988).
it's wise to let the baby decide when it’s time to switch—-if ever.
Some babies may nurse from one breast exclusively during a feeding
session. And that’s fine.
These discoveries suggest that women can improve the quality of their breast milk by feeding frequently and on demand.
quality matters. When milk quality is low, babies need to consume more
of it to get the same caloric benefit. Babies vary in their ability to
suck quickly and efficiently. If access to the breast is limited—as it
is on a regimented infant feeding schedule—some babies may not get
enough to eat (Woolridge 1995).
Low-quality milk can cause other
problems as well. As breastfeeding expert Michael Woolridge (MD and PhD)
has pointed out, low-fat milk can contribute to colic, vomiting,
diarrhea, and flatulence in infants (Woolridge 1995).
standpoint of our evolutionary heritage and the quirks of human milk
production--it appears that frequent feedings are better for babies. The
regimented, once-every-four-hours infant feeding schedule isn't
well-suited to the human infant's needs.
The hunter-gatherer infant feeding schedule...and beyond
How frequently should babies be nursed?
There is probably no
single, “right” answer to this question. But the practices of
contemporary hunter-gatherers--whose life-ways are probably most similar
to those of our ancestors--are strikingly different from those of
Among the !Kung San of South Africa, the
traditional pattern is for babies to be fed about 4 times an hour.
Feeding bouts are brief, lasting only 2 minutes or so (Konner 2006). And
nursing continues—on demand—throughout the night. The !Kung might
represent the extreme end of feeding frequency, but other
hunter-gatherer groups—from South America to the Philippines—follow a
similar pattern, nursing at least twice an hour (Konner 2006).
it’s not just hunter-gatherers. In a recent, cross-cultural survey
sampling 48 non-industrial societies--including nomadic pastoralists and
settled agricultural peoples--demand feeding was the rule in every
society for which information about the infant feeding schedule was
available (25 out of 25; Severn Nelson et al 2000).
It seems likely that frequent, infant-initiated nursing has been the normal human pattern for over 99% of human history.
Why it matters
Skeptics might argue that milk fat concentrations and hunter-gatherer
practices are irrelevant as long as babies thrive. Babies around the world have adapted to a variety of feeding styles, and, despite concerns that scheduled feedings may not serve babies well during growth spurts, there isn't yet any evidence that scheduling hinders the growth of healthy, full-term babies (Saxon et al 2002).
But whether or not scheduled feeding poses problems for energy intake, there are other considerations. Research suggests that feeding on demand has psychological benefits.
Less pain, less stress, and smarter kids?
Food is known to have a calming effect on babies, even if they are not especially hungry.
cry less and show signs of reduced pain when they receive small amounts
of milk, formula, or sucrose (see review by Shaw et al 2007; also Blass
1997a; Blass 1997b; Blass and Watt 1999; Barr et al 1999). The act of
suckling is itself an analgesic (Blass and Watt 1999), and breastfeeding may be a painkiller and stress-reducer.
some newborns were randomly assigned to be breastfed during a
painful blood collection procedure, the breastfeeding babies experienced
far less distress than did controls (Gray et al 2002).
babies cried for only 4% of the total procedure time, as opposed to 43%
for controls. Grimacing was also markedly reduced (8% v. 50%), and
breastfeeding babies showed less of an increase in heart rate (6 beats
per minute v. 29 beats per minute).
Interpreting this study is
difficult, because breastfeeding babies, but not control babies,
received skin-to-skin contact, which is also known to reduce pain.
the authors of this study believe that breastfeeding is a more
effective analgesic than skin-on-skin contact alone. When the authors
performed a similar experiment on the effects of skin-on-skin contact,
babies grimaced more than did the breastfeeding babies (Gray et al 2000;
Gray et al 2002).
The authors also note that babies who are held
without being fed tend to get frustrated, and require much more time to
settle down (Gray et al 2002).
And what might happen to a baby who finds her signals for food are routinely ignored?
While I've found no studies that bear directly on this question, a large variety of studies suggest that sensitive, responsive parenting contributes to secure attachment relationships and better child outcomes.
There is also intriguing research regarding cognitive development.
In what is perhaps the largest study yet to investigate the effects of an infant feeding schedule, Maria Iacovou and Almudena Sevilla (2013) tracked the development of more
than 10,000 British children -- breastfed and bottle-fed alike -- from birth to age 14.
There were no experimental manipulations. The researchers merely noted whether babies had been fed on schedule or on demand, and then followed their cognitive and academic progress. And the results favored feeding on demand:
At every age, kids who'd been subjected to an
infant feeding schedule performed more poorly on standardized
tests. Moreover, their IQs were, on average, 4.5 points lower.
Correlation doesn't prove causation, of course, but the results remained much the same after controlling for a variety of potential confounds, including parents' education levels, economic factors, health, breastfeeding, maternal smoking, and the children's exposure to negative discipline tactics.
The bottom line
Human breastfeeding seems designed to operate on an on-demand basis. When
babies determine the timing and duration of their feeds, they are more
likely to get what they need. Breast milk production increases or
decreases in response to the baby's demand. Breast milk quality may
If breastfeeding evolved as an "on demand" operation, mightn't babies have evolved the psychology to go with it? It's speculative, but the evidence is consistent. Feeding reduces pain and stress.
Moreover, a recent study hints that feeding on demand leads to better cognitive outcomes -- for breastfed and bottle-fed babies alike.
References: The infant feeding schedule
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For more references pertaining to the
infant feeding schedule, see my article on breastfeeding on demand.
Content of "The infant feeding schedule" last updated 3/14