http://pt.wkhealth.com/pt/re/adcn/abstract.00042223-200609000-00008.htm;jsessionid=FVjJZ2cJJP00SnrcBKwx7jtpGw8xpQyYnvW9GhMKSTNJ0hJZPwk2!-1640309041!-949856145!8091!-1

Savenije OE, Brand PL.
Accuracy and precision of test weighing to assess milk intake in
newborn infants.
Arch Dis Child Fetal Neonatal Ed 2006;10.1136/adc.2005.091876 [doi].
OBJECTIVE: To assess accuracy and precision of test weighing to
estimate the amount of milk intake in newborn infants. Study design:
94 newborn infants fed by bottle, cup, or nasogastric tube, were
weighed before and immediately after feeding by a blinded
investigator. Actual milk intake was determined by reading the ml
scale of the milk container before and after feeding. The accuracy
and precision of test weighing was assessed by examining the
frequency distribution of the difference between weight change and
actual milk intake. Weighing performance of the scale was assessed by
calculating the standard deviation (SD) of repeated weighing standard
weights of 1.5 and 4 kg. RESULTS: The mean difference between weight
change and actual milk intake (accuracy) was 1.3 ml, with 95% of
differences ranging from -12.4 to 15 ml (precision). The maximum
difference was 30 ml. This difference was not influenced by the
presence of monitor or oxygen saturation wires, intravenous lines, or
vomiting of the infant. The maximal SD of repeated weighings was 0.97
g. CONCLUSIONS: Test weighing is too imprecise to be clinically
useful in newborn infants. Infant weighing scales are not sensitive
enough to pick up small changes in infants' weight after feeding.

And I can't access the text of this yet but the title is interesting:

Weighing babies to assess milk intake is unreliable

BMJ  2006;333:1012


What do those of you who do these weights think?

Heather Welford Neil
NCT bfc, tutor, UK

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