I wouldn't personally go on feeling and guessed weights alone. It can be pretty hard to feel a difference in grams. Especially when any length of time has passed since your last reference point.
Also, I've personally been through this type of thing before, and a $10 scale was able to show me that they had in fact put on about 30% of their weight from the time I got them. Yet going on feel and sight had me doubting their progress.
Fecal sample still isn't a bad idea. Just saying, it's easy to perceive wrongly about this sort of thing sometimes, and scales are cheap and easy to find.
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