A scale is good if you arent very experienced. But you did observed he feels heavier and more fluffy, so he is surely adding good.
If you dont have a scale, try to at least measure them with your hand... Sometimes its good enough.
Another question. The little guy is pumping his hind leg wondering he is constipated from antibiotics?
Nursing his mother and drinking some kmr. Only 10 days old what could I give him as I am not sure if he pooped lately? Mom cleans him and I tried a warm damp washcloth and nothing.
I woke up to check and feed the little guy , he looked like he was sleeping. He had died.
I don't know if it was that bump under his navel or something I did. He kept working the hind leg like he was constipated or? He did drink from the bottle early evening. I did put him with his mother but not sure if he nursed much. He seemed ok ....
I did try running warm water over his bum area and nothing and later a tiny pc of suppository and nothing came out. The leg motion was like going to scratch his side which was odd as none of the others did this. Anyway I thank everyone for their help, I thought he was improving.