Underside of cats fur wet and yellow

have two kittens jasper and buddy. Five months old. Living with my dad at present as I'm homeless. I come see them every day or two and provide their food and litter. Buddy todsy has why looks like hardly any further news is Underside his belly right above his genital areach and stops just before his chest. I think that is because it's wet though and yellow. What is this. Is it just he has peedone over himself? Or something else. He is loving acting fine completely normal playful happy cst wanting kisses and to licking me all the time. They have never we been to the vet as I was homeless so moved around so muxh I couldn't register them until now. They are the good jasper meiow a lot.whenever I see him maybe for attention or maybe be a useful he's missed me idk. Buddy is quiet laid back. He is currently licking the area. I don't know if that is a sign of anything. Buddy also always has seep in his eyes but jasper doesn't.

They are happy and playful and loving. I am registering them with vet tomorrow to get appointment asap they have never error had vaccines which I know is dangerous so I ned to get them asap csn they still get them if they are 5 months old? Not neutered though that's the plan because if the health benefits.

Jasper likes to um sucks on buddy. I'm worried about skin irritation or hair loss. Also could buddy be over grooming himself after jasper sucks on him? I'm mot sure what this is the yellow is mostly gone but I'm still worried.

Please could someone give me some advice I'm concerned for Buddy and want to make sure he is healthy and take him to vet if not

Definitely get them to a vet.

I think that's likely from being sucked on. He should see a vet, and you need to get your suckler a replacement for his brother.

What kind of think csn I use to replace sucking I thought he would have grown out of it by now.. maybe it's because during the day they are kept in one room as my dad has another cat used to be kine they don't get along and the cat hurts them so they are separated k during dsy. Csnt leave them alone my dad works I come visit them every day and spend time with them. They are given to s too early though I didn't know at the time. Got them at 8 weeks old. That May be cause of the sucking jasper does.

A blanket with the corner dipped in kitten milk replacer works.

Thank you so much! I'll buy some kitten milk tomorrow

Is there anything that I can do to help buddy's skin in CAE of infection or to ease any discomfort

Does anyone have any advice for keeping buddy's skin okay or anything other than milk I can use to distract Jasper as it's not working?