It's not worms. To me, it looks exactly like coccidiosis.
You can try probiotics first and see if they respond to that. Yogurt (plain - 1 teaspoon per 1/4 cup of crumbles, wetted just enough to kinda mix), probios or fastrack from the feedstore, acidophilus from the grocer/pharmacy/health food store. Use for two days only if you don't see any babies getting ill. You can also use apple cider vinegar in their water (1 teaspoon per average starter baby chick waterer). Make sure it's organic.
Or you could use corid or sulmet in addition to the probiotics. (You'll need to use the probiotics in either case because their guts are just forming bacterial colonies, they're not born with them.)
They are very very unlikely to have worms at this age and kept inside.
I suspect your bedding is the issue. They need to be on wire, or on (pine or aspen) shavings, or on play-sand (from the hardware store). I see droppings on the water shelf, and I know that all baby chicks will peck the poop off of their feet and eat it. Mine are doing this too incidentally, actually worse- they flat out poop in their water and food. So it's not that you're a bad parent. It's just how chicks are. But the bedding needs to be different.
Incidentally, medicated (amprolium) feed is only a coccidiostat - not a coccidiocide. Coccidiostats are designed to slightly curb cocci and allow birds to develop a little of their own resistance but keep blooms from happening in normal clean conditions. Coccidiocides (sulmet, corid) are designed to kill off cocci and treat illnesses, and are thus more harsh on the gut overall. But needed where there is actual disease.
So the medicated feed (if it's medicated with amprolium) is doing its job, but the job was a bit hard for it. So give it some help.
Please feel free to pm me if you have any questions. Otherwise they look like lovely babies!
You can try probiotics first and see if they respond to that. Yogurt (plain - 1 teaspoon per 1/4 cup of crumbles, wetted just enough to kinda mix), probios or fastrack from the feedstore, acidophilus from the grocer/pharmacy/health food store. Use for two days only if you don't see any babies getting ill. You can also use apple cider vinegar in their water (1 teaspoon per average starter baby chick waterer). Make sure it's organic.
Or you could use corid or sulmet in addition to the probiotics. (You'll need to use the probiotics in either case because their guts are just forming bacterial colonies, they're not born with them.)
They are very very unlikely to have worms at this age and kept inside.
I suspect your bedding is the issue. They need to be on wire, or on (pine or aspen) shavings, or on play-sand (from the hardware store). I see droppings on the water shelf, and I know that all baby chicks will peck the poop off of their feet and eat it. Mine are doing this too incidentally, actually worse- they flat out poop in their water and food. So it's not that you're a bad parent. It's just how chicks are. But the bedding needs to be different.
Incidentally, medicated (amprolium) feed is only a coccidiostat - not a coccidiocide. Coccidiostats are designed to slightly curb cocci and allow birds to develop a little of their own resistance but keep blooms from happening in normal clean conditions. Coccidiocides (sulmet, corid) are designed to kill off cocci and treat illnesses, and are thus more harsh on the gut overall. But needed where there is actual disease.
So the medicated feed (if it's medicated with amprolium) is doing its job, but the job was a bit hard for it. So give it some help.

Please feel free to pm me if you have any questions. Otherwise they look like lovely babies!