Gonneke writes that making up formula is more precise than weighing. 

Unfortunely or fortunately if you really think about this, there happens to be a fair amount of 
evidence providng this not to be the case.  One of the many dangers of formula use is imprecision 
in visual measurements of bottles.  They have done any number of studies on how even highly 
educated parents make up formula solutions of highly variable solute concentrations, thus 
endangering the baby.

Again, I have already posted on the high degree of variability of looking at the meniscus - the dip 
in the liquid due to water tension.  Even minute changes in your eye level can cause changes in 
your interpretation.

I wish NEVER again to see a woman who has been told to pump and bottle feed since this is more 
precise than test weighing.  If you have no other reason for using a scale, at least consider this 
when a health care professional who did not spend enough time in chemistry class to understand 
why eyeballing a line on a bottle is not precise enough to determine intake tells a mother to stop 
breastfeeding and pump and bottle feed again.  This should be as abhorrant to all of you as giving 
out formula packs in the hospital.  It is a completely unecessary intervention.  And in this case, I 
do consider it an intervention because it most certainly can directly harm a breastfeeding a baby 
just by its practice .... rather than just the good, bad or indifferent advice that results from use of 
other tools.

PLEASE, I urge all of you to not use pumping and bottle feeding as a means of estimating intake, 
nor to consider mixing of powdered formula as accurate.  

Best regards, Susan Burger

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