hi david,
ya.. i think danya is teething too.. usually they drool, lost of appetite and the poo poo can smell sour and be loose too..can even poo more frequent then usual. clean her buttock once she poo, the sour poo poo can easily cause rashes badly.. for yilin, she will even have a little flu when teething.
weight gain poor might be due to she kena broncholitis the other time, appetite dropped. she start taking solid? try giving her more meals (solid or milk) in shorter interval.
she has part of her intestines removed right. her appetite is small? if yes, then i think it is normal tat the weight gain is slow ba. some premmie is smaller in size, maybe she belong to tat category too..
i have a friend, her baby is full term baby but her intestine was damaged. the doc removed about 40% of her intestines after 4 days of birth. her appetite is small cos not able to give her too much at a time. she used to be small size. now think she about 6-7 yrs old.. big size liao.. eat alot.. haa.