Keep giving them you are doing the right thing and got on it fast

May need them for a few weeks
I use nutritional yeast 1tbs per 1 cup of feed till 10 weeks
Then add a sprinkle to the feed as adults
I have Pekin , khaki and 5 of their babies and my two boys are much bigger then mom so want to make sure they get the extra niacin in case
I also stop using starter feed by 3 weeks and move to grower
Every week I add vitamin B complex to the water just for an extra boost
I read you do use the nutritional yeast
Some just need more then others
Like us humans we are all different