I would have a fecal ran ASAP. You really need to know what you're dealing with.
If you can't have a fecal done, start treating for coccidia ASAP.
I use DiMethox, 1 cc per 5# day 1, 1cc per 10# days 2-5.
BUT...if the fecal shows cocci IS the problem, I would treat for a full 21 days to make sure you kill as much as possible.
Coccidia can damage the intestines and cause kids to never reach their full potential, even when caught early and treated.
Untreated kids can die.
Medicated feed (w/rumensin or deccox in it) is great...but only has enough medicine to prevent cocci...it won't cure it if they have it, and they have to eat enough to get the medicine up to therapeutic levels.
Because I'm not taking any chances (learned about cocci the hard way - lost kids our 1st year dealing w/ it), I treat our kids w/ DiMethox every 21 days all spring / summer / early fall.
If the fecal shows tapeworms, use a white dewormer, treat for 3 days in a row, and have a repeat fecal ran in 21 days.
If the fecal shows barberpole or stomach worm, use ivomec injectable, but use it orally, like a drench. 1cc per 25#. I would retreat every 7 days and get a new fecal ran in 21 days.
Barberpole is nasty and if the ivo doesn't work, you'll need to try a stronger dewormer.
Good luck!