Reading your post almost felt like deja vu, Luvyna! I had the same situation with Iggy back in January. 5 months old at the time, under 200g, and wasn't pooping or peeing despite a regular weekly feeding schedule. This was also a change from his previous norm, and he also developed a mild case of sausage butt, like so:
I tried the warm water bath for him once, I think around the 30-day mark, and it prompted him to produce several large urates and a cloud of liquid pee, but still no poop. He also, unsurprisingly, didn't enjoy the experience one bit, so I decided to avoid trying it again unless absolutely necessary. Finally, at the 37-day mark, he pooped and peed on his own - very explosively, I might add - after I had just finished deep-cleaning his tub and was about to put him back into it. So I guess the moral of the story is, continue keeping a close eye on him, but also no need to panic yet. The little ones seem to be able to save things up for a very long time.
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