Have been caring for a feral mom and 4 kittens since July 1st. Littlest kitten was severely sick and mom ended up rejecting so I took on role of mom. Started with clavamox and after no improvement switched to azithromycin. That antibiotic course ends this Friday 7/19 and we've seen good improvement on that in terms of snot/congestion. My issue is that despite bottle feeding KMR every 2-3 hours and this kitten being hungry and eating every time, it's not gaining weight. We went to the vet at 1 week old with everybody and at that time this little one weighed 4.6oz. Now at 3 weeks old we're only weighing in at 4oz. Fluctuating some between 4.2 and 4 but at least maintaining 4 oz but not gaining anymore. The other kittens are almost triple it's size now and it eats vigorously every 2 hours. We'll be doing more vet trips as well but I'm just looking for any advice on how to help this little thing out.