How much milk does a baby “need”?  As I remember, this question was asked 
about *newborns*.  This is really important to remember.
 
Pat Young says 2 ½ times the baby’s weight in pounds gives the number of 
ounces needed per day.
 
Gonneke van Veldhuizen says 150 cc per kg per day (which is about the same as 
Pat’s rule---2.47 times the weight in pounds.)
 
Marian Rigney has a more detailed schedule for the first week, taken from a 
recent  Textbook of Neonatal Medicine.
     30 mls  /kg on Day 1
     60 mls  /kg on Day 2
     90 mls  /kg on Day 3
   120 mls /kg on Day 4
   130 mls /kg on Day 5
   140 mls /kg on Day 6
   150 mls /kg from Day 7
The mathematical symmetry of this schedule makes me wonder whether the author 
began with the 150 cc per kg figure and calculated backwards to zero on Day 
0.  But when you compare it to work by Neville et al, it’s not far off the 
mark.
 
Neville’s measurements of milk output in eleven women over the first eight 
days are shown in graphs on pp 269 and 270 of Clinics in Perinatology, June 
1999.  Her description says, “Milk transfer, originally less than 100 ml per 
day, began to increase about 36 hours postpartum, continued dramatically 
upward for about 48 hours, and then leveled off [at 600 ml/day] after about 4 
days.”  600 ml/day would be 150 ml/kg for a 4 kg (or 8 # 13 oz) baby.
 
Marian Rigney also gave us a quote from that neonatology textbook: "Healthy 
bottle fed infants will also 'know' how much fluid they need and should be 
allowed to consume milk when they want it, to the volume that satisfies 
them."  
 
I have some problems with this quote.  I assume that a healthy infant in its 
mother’s arms feels thirst and probably feels hunger…and from its rooting 
behavior I guess that it almost surely feels some kind of need to suck.  If 
the baby is offered a breast and is able to attach effectively and is left to 
its own devices, then suckling will continue until the baby stops.  Why does 
the baby top?  Presumably because it is no longer thirsty or hungry, or no 
longer needs to suck, or has become “too tired to suckle,” or has fallen 
asleep.  From my observation of newborns, I think they mostly stop nursing 
because they fall asleep and release the breast.  (CCK at work!)  Then when 
they wake up, which could be in 1-2 minutes or in 10-20 minutes or in some 
number of hours, they seek the breast again…for some or all of the reasons I 
listed before.  Also from time to time they are quietly alert and ready to 
interact visually with their environment.  And so life goes on…
 
But this textbook quote is assuming that *thirst* is the only motivation for 
feeding/suckling (“infants…‘know’ how much fluid they need…”).  It also 
assumes that whatever is in the bottle has the correct amount of nutrients 
per ml of water so that satisfying thirst automatically satisfies the baby’s 
needs for carbohydrates, fats, and protein.  Also it assumes that any 
presumed need of the baby to suck or suckle is satisfied by the amount of 
sucking they get from the bottle. That’s a lot of assumptions.  
 
Magda Sachs questions whether we really know enough to come up with *any* 
mathematical “formula” to guide us about the proper amount for babies to eat 
or the right rate for them to grow.  Why not look at the baby…and the baby’s 
parents…and the baby’s siblings, if any…and the baby’s general health…and 
the baby’s environment…and the mother’s environment…etc?  I agree.  An 
assessment of a baby has to look at the whole baby.  If the baby’s growth 
rate is slowing down relative to other babies of the same age, it might mean 
that the baby has a problem---it doesn’t mean automatically that the baby 
needs to eat more.  Instead, it means that the grownups who are responsible 
for that baby need to take a look and see what’s going on.  And this is 
assuming that the chart that shows how other babies of the same age were 
growing is based on babies who were being fed the same stuff in the same 
way---exclusively breastfed babies compared to other exclusively breastfed 
babies, for instance.
 
My main reason for writing, though, is to put out a caution about that “150 
ml per kg per day” rule. That rule works out to 750 ml for a 5 kilo baby, or 
25 ounces for an 11 pound baby.  Studies of formula-fed babies from Fomon’s 
1974 text on infant nutrition did show that formula babies, who started out 
after birth taking in more than 110 calories/kg/day, stabilized their intake 
at 100 calories per kg per day around the age of four months.  This means 
that their formula intake increased as they gained weight.  But breastfed 
babies are different.
 
The average milk intake for exclusively breastfed babies published by Neville 
et al in 1988 is around 600 to 800 mls per day over the first eight months.  
As the baby gets older, you might think it would require more milk---like the 
formula fed baby---because its weight is increasing. However, what studies 
have shown is that as the breastfed baby gets older, the caloric intake per 
unit of weight decreases. 150 ml of milk contains roughly 100 calories.  
According to a paper presented by Garza, Stuff, and Butte in 1986, a six 
week old breastfed baby takes in about 100 calories (150 ml) per kg; by 2 
months the baby is taking in about 80 calories (120 ml) per kg. From around 3 
months the calories per kg stabilizes at about 70 (105ml/kg), and the baby’s 
volume intake also stabilizes somewhere around 750 mls per day.
 
It is really important that we understand this difference before we advise 
moms who are going to work. Otherwise they’ll multiply their (older) baby’s 
weight in pounds by 2 ½ oz or in kg by 150 ml, and they’ll be intimidated at 
the amount of milk the rule says they have to supply.  For an 8 kg baby that 
would be 1200 ml per day, or for a 17# 9 oz baby, 40 ounces.  Combine a 
mother who is anxious about leaving her baby, a baby who is fussy being in a 
new place without its mom, a caregiver who thinks formula will "satisfy" 
babies better, and an unrealistic rule for how much milk the baby requires 
for its weight, and you've got a recipe for unnecessary supplementation.

Peace.
Chris Mulford
Swarthmore  PA (eastern USA)

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