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First, at what temperature is your brooder currently? It should be 95 the first week, 90 the second week at the coolest. Are the babies clustered around their brooder light, or is it hotter there?
Sometimes during shipment babies get pasty bottom. All chicks are born without any appreciable bacteria in their digestive tract. However the avian system (and most other animals) have good bacteria that line their digestive tract, producing B vitamins, excreting enzymes that make food more absorbable, keeping bad bacteria and yeast under control through competition with them. Baby chicks' guts are essentially open territory and ready to be colonized. It's first come first serve! Good bacteria are generally a little more sensitive to stress, etc. In a hen raised baby, the chicks would get the good bacteria by pecking at their mom's vent and droppings as they learn to eat. But in hatched chicks, they don't have that. So it's a touch-and-go situation for the first two weeks.
To that, add stress of shipping, hatching, new diets, etc.
I like to give all babies in the 'starter' period (1-8 weeks) plain yogurt daily as it's packed with live lactobacilli, the same bacteria that colonize the gut of a chicken beneficially. It only takes a little...1 teaspoon per 6 3 day old babies. (I give it on the second day that they eat.) Give that daily to your pasty bottomed baby for 3 or so days. Well give it to all of them. If they don't eat it directly, you can mix the yogurt and an equal amount of water together, then mix that with their crumbles. let soak for 10 minutes til damp, not wet. If it's wet, add a little more crumbles. Make a small batch - only enough for them to eat in about 10 minutes. Take their food away while you're preparing this, about a total of 20 minutes. Then give them the damp mash. In healthy babies or with just pasty vent, you can mix a little yolk from a boiled egg, mashed with some water, to that mix - it's great stuff. If some babies eat more than others, remove them temporarily to a little cardboard box so the others can get some, too. Then put them back when everyone has had some.
Continue to put a little olive oil at his vent. Make sure the other babies don't pick it. YOu can also give a tiny bit of babyfood oatmeal (less than 1/2 teaspoon) in the damp mash. That will help stop constipation, doesn't require grit, and the tiny apple pectin in it will help encourage GOOD bacteria to thrive in your babies as well as clean out the digestive tract. Only do that on the first day.
The babies can get the mixture of water, yogurt, egg, and crumbles as a daily mash once a day for a week. Then just try the yogurt weekly for weeks 1-8, monthly from weeks 9 through month 5, then weekly again during the first weeks of laying. (Only as grown up girls, they'll get 1 tablespoon per bird - adjust up as they grow - it doesn't have to be exact.)
In the mean time, watch all babies to make sure that they all eat. At about four weeks, you might have to divide into two brooders - one with the bigger chicks, a second with the smaller more delicate chicks to let them catch up. If babies fall behind (and you should pick them up daily to check weights for the first few weeks and to get them used to handling) then put them in the 'lightweight' brooder.
Watch for any diarrhea, lethargy, loud chirping, etc. Keep the brooder good and very very dry, all feeders and waterers free of poop. This helps reduce the chances of secondary coccidiosis. Also all babies should be eating free-choice amprolium medicated "chick starter" or "chick starter/grower".
OK, so a summary - assuming the baby has the right diet and temps...
Feed all babies a damp mash of yogurt, water, (egg), crumbles, and applesauce on day 1.
Feed all babies a damp mash of yogurt, water, (egg), and crumbles on day 2-7.
Feed all babies a damp mash of yogurt, water and crumbles weekly from weeks 1-8.
Continue the olive oil only on the vent for 2-3 days.
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Barred rocks are usually exceptional eaters and growers. You might want to put this baby and the smallest of the rest into a separate brooder, or somehow make sure this little guy is getting more than the others. I suspect he just didn't get the full load of good bacteria during those crucial first days.