H.L.
Hmm, well, first of all, I thought pediatricians had stopped giving this advice about feeding on a schedule. It's nonsense, meant to be a convenience for you, but not necessarily what's best for the child, as it's likely to encourage overeating, but also taking small meals more frequently--not conducive to a long night's sleep. It's best to let the child eat when he's truly hungry and sleep when he feels like it, unless he's resisting napping at all or going down at night. But, a baby living on swing shift is not unusual, and they generally will gradually change sleep schedule to fit yours. It's too soon to be trying to put him on a schedule, convenience or no!
But, the answer to a wakeful baby is two-fold and simple. Babies grow rapidly during sleep--you'll notice a sleeper that fits at bedtime may suddenly be too short in the morning, and this has been documented in studies. So, it's not surprising that a baby may wake after only a couple hours of sleep, ravenous. You don't mention any feeding other than breast. Feeding baby a supplemental bottle of your breast milk with a bit of cereal mixed in--rice is easiest on the tum--and the nipple openings a bit larger to allow the slightly thicker texture, should see baby through most of the night. It may seem too soon given his age, but his size at birth means he's going to be ready for supplemental food earlier.
However, if you think it isn't appetite but a touch of cholic, then get some baby--size glycerin suppositories--ask the pharmacist if you can't find them in the aisles. Just before bath time each night, every so gently insert one just a little ways in baby's rectum, where it will quickly melt--they are narrow, soft, and smooth and will slide in with no discomfort. Gently move the suppository just a bit for a little more gentle stimulus. The effect is to help soften the stool, but also to stimulate the natural urge to push. Babies need to be taught how their bodies work, from using hands, to focusing eyes, to making sounds---to pooping. A week or two of this routine, and he'll figure out how to expel gas and poop on his own, making for a happier tum and more restful night. The glycerin is completely safe, and the most gently laxative around. Follow up with a warm bath and a good feeding, and baby should sleep most of the night. This is absolutely the best remedy for cholic, regardless of severity, and was recommended years ago by my grandfather, who was a family physician. This has been used successfully and safely by at least 3 generations of our family. Hope this helps!