I am FAKing so can't type much, will be back.

BUT I had to write to assure you that if BF babes don't poo for a few days it is normal.
It doesn't automatically mean you have not enough milk, but rather that as BM is so good, often it creates very little waste on the baby - meaning no waste = no poo. Purely because there is not enough waste in the bowels to create the urge to go.

Get onto an LC and the ABA - there is no reason to wean, you have most likely, more than enough milk -if he were starving you would know about it, and the first signs it was happening would NOT be lack of poo.