Fio,
It's called insensible water loss.  Babies sweat, breathe out water
vapor, etc.  When test weights are done, they must be done immediately
before and immediately after the feeding, and on a scale manufactured
for that purpose (accurate to 1 or 2 grams).  In addition, the baby must
be placed in the same position on the scale, with all little limbs
"inside" the scale basket.
--
Catherine Watson Genna, IBCLC  New York City  mailto:[log in to unmask]

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