Our 17 week old kitten is still trying to nurse on his mother since she now has a 3 week old kitten as well. This morning he was OK, tired but OK but now he is weak and breathing a little hard. He is drinking water from a syringe when we give it to him and seems to be a little better afterwards, but still to weak to stand. We can't afford a trip to the vet right now, we are in between paydays and the vet won't see him if we can't pay. Is there anything we can do for him in the meantime? Any advice is greatly appreciated.