I've seen several moms who had gastric bypass and bf just fine, supply 
wise. I saw them for initial latch difficulties and laryngomalacia in 
the babies, once those things were ironed out, things went well.

If there's no fat in the pumped milk, it most likely means the breast 
wasn't emptied well! The way milk is produced, protein, sugar and fatty 
acids are all kept in balance, so it's very , very unusual for there not 
to be enough fat in the milk. Studies also show that the babies that 
gain best are those whose moms have the LOWEST creamatocrit at the end 
of the feeding (in other words, their moms make more milk, and the 
babies have emptied the breasts less by the end of the feed).

Catherine Watson Genna, IBCLC NYC

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