Hi glad your little ones putting on weight, my alicia has acid reflux but its calmed down an awful lot, just the odd bouts now and again.
and congrats on your new job

sorry im normally on the weightloss site but i lurk every so often.
anyway if ive got my info right acid reflux is where they projectile vomit and they fidget and cry when they feed, etc...as in silent reflux is where they basically just sit there and some sick just flows out (sorry havent read all the way back but was wondering if your little one had been being sick.)and one of the major symptoms is weightloss.
best advice i could give is check all the solid foods you give her for acids, etc ive found citrusy things and even stewed rhubarb sets alicias reflux off because of the acidity levels in it.
the babywhisperer site has some good info on reflux and I think theres another site called crying over spilt milk.
www.cryingoverspiltmilk.co.nz/WhatisGastricReflux.htm hope ive helped hun

Ems x