I am a foster mommy for our local Cat Care in Port ELizabeth-South Africa

This is the first litter that I am looking after. I received the babies on day 1. We lost 1 little girl a few days later. She had some birth defects and her mommy was very sick,(biliary) and the mommy had to be put to sleep, she was to sick to be saved. These are feral cats that Cat Care captures and then has them spayed or neutered. The 2 little boys are doing well. They were +- 60g when we collected them and they are now 142g and 118g.
I feed them every 3-4 hours but I see they do not whant to drink so much every feed.
Do I now feed on demand
I give them Kitty milk, it is a formula that I bought from the vet. I see that I now have to change the formula from 1 scoop powder and 2 water to 2 scoops powder and 3 scoops water per feed.
They do not like the change in formula at all.
I am also giving them Protexin (probiotic powder ) in every bottle...just a pinch.
After loosing the one on Saturday I am so scared of loosing these 2.

I have decided that we are keeping these 2...there is no way I can give them away

Any advice would be welcome

Thank you for the advice.
They had a good morning bottle. I did not wake them during the night. Their eyes are open but I see that with one of them the little eye has closed again. I used a damp (  warm) cotton this morning to wipe it and the eye is full of puss, I will be takeing him to the vet this morning.
Will post again to let you know what the vet said

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Our little girl had a rough night on Friday. Both of them have been constipated, and I bought them some meds at the Vet (Lactolose) on Tuesday. When our little girl made a poo on Friday night she pushed so hard that her little rectum came out.....I just about died. Luckily it went back by  itself, but the doc showed me what to do if it happens again and I have to push it back.

 

They gave her some liquid under her skin and a penicillin injection but they said that if the blood in the poo is because of a viral infection the outcome is very bleak. They cannot treat her, the antibiotics are too strong for kittens this size. She has not made a poo since then and I am dreading the next one. Little boy is still constipated and I am giving him meds every 6 hours to see if we can sort it out.

 

This is a real emotional roller coaster ride. If we had a good feed, good wee and a poo I am happy for the next 3 – 4 hours, but if they do not drink or I see something wrong I am a wreck until the next feed.

 

They seem so healthy and happy, they have started playing with each other and it the best thing on this earth to watch them

Hi Scratch
Thank you for your reply. I need advice please.

When I took our little girl to the Vet Friday they put her on Gastroped...1 drop 2xday.(name on meds bottle is Biskopaar/Gastroped)  to help with the runny tummy. She has not gone again since the horrible episode on Friday night, and I have taken her off the meds, I am not sure if I keep her on it she will become constipated.
Little boy is still on Lactulose 0.2ml every 6 hours to see if we can get him to have a poo.
How long should I wait before I have to worry with them not passing a stool.
I feel so stupid, it is much easier raising human babies than kitty babies.At least they are picking up weight......he is now 316 g and she is 252g...it could also be that they are just heavy because of all the poo