hi
we had similar problems with our daughter (not so much the poos + vommitting - but v fussy feeding, struggling to get anywhere near the required amount of milk into her, had to abandon breast but bottle not much improvement, arching back, uncomfortable, crying during each feed, bad sleeping) and it was a very stressful time. Starting about week 3 and lasting until about 7 months
we tried tongue tie cutting (same woman as mentioned earlier actually and it did help with breast feeding for first two weeks), changing formula, changing bottles, constant burping, infacol, ranitidine and omeprazole, weaning early and various visits to gp, paediatricians and a dietician.
nothing really worked. She eventually just outgrew the problem and now loves milk (even though she's supposed to be cutting right back now as a healthy 18month old - typical
)
I think she probably did have some bit of silent reflux to begin with and maybe we wasted time messing around with the 'lite' meds like infacol etc and missed it which created a problem. Very hard to say.
But the big 'lesson' was that it was our first child and we were so worried that we mistook a lot of her tiredness for hunger and her personality (feisty - never liked being held) for discomfort. We tried too hard to keep up to the scheudled levels of mls per feed/per day and got stressed when she wanted less (which was most of the time). We tried to keep to a schedule of feeding but then when one or two were missed/bad feeds we increased the number to make up for that so that we ended up with 15 feeds per day of which maybe 5 were 'successful'.
Also, which is obvious now but was impossible to tell at the time, our daughter has a mind of her own from early days and didnt enjoy being held flat and having anything stuck in her face to feed. she wanted to control things before she was physically able (although she effectively achieved that anyway). and she got a bit emotional when over tired or over hungry so feeding became v difficult and we just kept making it worse
it was much better when (i) we started feeding her in her bouncer (so she felt more relaxed (in front of tv sometimes against all advice im sure)) and (ii) we starting weaning her (as she enjoyed food more and also we were sure she was having some more important calories etc)
but all in all she outgrew it and zero residual side effects. I really regret all the extra stress and worry we heaped on ourselves and it made the first 6 months miserable when it need not have been. So not sure if that helps anyone but just wanted to say that it is often darkest before the dawn and try to to stress too much.