4-5 day old stray kitten won't poop

Update little Moss Pooped quit a bit, although it was yellowish in color there were hard almost guinea pig pellet poops with it as well. After he pooped he became fussy and I went to see if he was hungry by putting his empty eye dropper near his mouth, he latched on and wanted food so i made him food and he ate and then fell asleep now he is purring so loud it is the first time I’ve heard him purr this loud. After an hour I’ll try to make him potty again, hopefully more poop comes out if so this momma will be super duper happy.

Will do, I am so happy and so is he, no more random crying (Not really random must’ve hurt) no longer crying hydration is back to normal or close to since I did the skin test, yesterday I did it and it stayed up now it goes right back into place. Also found out that this little stray is actually almost 7 days old since his eyes are 1/2 opened. Happy my little man feels better thank you all for your help, I was worried and ya’ll helped me so thank you! https://www.instagram.com/p/_ppzRiu8Wh/?taken-by=thedreamersking here is a picture of little moss napping! Thank You again! 🙂

Moss is 18 Days old today and for the past week I must say his poop has changed from Yellow Mucus, with large white specks to yellow then I changed his formula from powdered formula to premixed kitten formula and within the next few days his poop changed to dark yellow, then orange with mucus to plain orangish brown, with the consistency of a cow patty and now it is brown and a little softer than firm. I also went to the vet with him and the Vet was surprised he didn’t have worms, also that he was unnaturally healthy considering he was a baby from a stray cat. The vet also said the reason his poop was so yellow was because he didn’t get enough colostrum from his mother and so when I started him on formula it messed up his belly, so after changing his formula he feels better. He also plays more and walks around a lot, he has also learned how to climb out of his bed so we bought a little kitty pool and made it his area with his soft blanket and toys, as well as heating. He also met his two brothers which are guinea pigs, he wanted to play while the guineas were too scared to go near him. One thing the doctor was concerned about was that his head shakes when he is focusing, excited, or fatigued and he said that he may have Cerebellar Hypoplasia or head tremors. But he said he should be fine as he grows older, his head will continue to shake and he may fall over but he is healthy. So there is the update on Little KT Moss. Oh and his ears are now on top of his head, and he can walk without wobbling as much!