My kitten started having the poops and is losing weight and all her test came back negative

Thank you for your question. Kittens very commonly have intestinal parasites that can cause problems, and we will often routinely deworm them even if we don't see parasite eggs, as they are not always shedding. It would be best to have your pet seen by a veterinarian, as they can examine them and see what might be going on, and get treatment if needed.

I have a lactating queen, 4 kittens 6 weeks old and still nursing, mum cat is eating and drinking 3 times usual amount but has no weight on her since nursing and her faeces are part loose and part almost diarrhoea,noticed a few air bubbles in the sloppy part. Seems bright but still cleaning the kittens poop majority of time,kittens 40food/60milk weaned but enjoy her milk much more. Mum is on stronghold. Is weightloss and loose stools normal for lactating queens?

Lola should be able to maintain her weight while nursing, unless she was underweight to begin with. There are many parasites that can cause problems in pregnant and nursing cats, and it might be a good idea to have a fecal sample checked by your veterinarian to make sure that isn't a factor. If she continues to lose weight and have soft stools, it would be best to have her seen.