I know this has been discussed on Lactnet before.  How do you know that 
looking at the line on the bottle is accurate?

Jennifer Stevens, RN

In a message dated 11/11/2006 3:33:52 PM Eastern Standard Time, 
[log in to unmask] writes:
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

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