Wow, this has been busy today. Shhh, whisper please, DD is asleep in her cot and DS asleep in the car while DH reads paper (they've just been to feed the ducks) - I'm grabbing 5 mins on MN when I should be getting veg chopped for dinner
LB - you are doing so amazingly with DS and his reflux. By 11 weeks I had to give him top-ups of formula to get his weight to start increasing (at that stage he was 9lbs 2oz - only 2lbs 2oz above his birth weight), so I think you're brilliant. Have to say that I feel that where i went wrong was trying to get him into a routine and feeding 3 hourly, whereas he needed more than that. Sounds like you just had a bad day where he only took foremilk and Sorky has had some good advice for you. Some tips I can offer (whether useful or not) and you've probably heard them all already:
Raise his cot to 45 degree angle (raise whole cot, not just mattress) - we used yellow pages and our fireproof box.
Do you have a wedge cushion from when you were pregnant? We used ours to raise his change mat as well, so he wasn't flat to change.
When winding, only rub, don't pat as this can aggravate the reflux, although I found that walking round jigging him slightly helped wind come up without too much sick.
Put a muslin down across the mattress under where his head will lie so if he's sick you don't have to change whole sheet.
Raise bouncer to highest elevation for him to sit in (if it's adjustable).
Always have a bib round his neck - useful for catching some sick.
All babies are different, but DS was really refluxy and he grew out of it by 8 months (you have to watch for the lovely orange stains when he's on solids!) and he was a real porker by then, so don't worry about these early weight problems. He does still have a dairy and egg intolerance, but these aren't necessarily linked to the reflux.
Sorky - thanks for your tips on the feeding, DD has been feeding really regularly and we've had a couple of green poos here and there, so your advice really helps.
LB - I know dummies are a bit of a personal choice, but we have found that quite often, DD will look like she wants to feed and then fusses on and off - if it's been a while since she woke and is yawning, a dummy can send her off within 10 mins, even if she fights it to start with - she then gets some sleep (not necessarily really long) and then feeds well once she's woken.
I really don't have all the answers, but hope that some of these tips are useful to you, as I get so many really useful tips on MN.