it's normal in most cases. breastfed babies poop lesser, as the breast milk is efficiently absorbed, leaving behind little waste. my 3mth old son went through a period of not pooping for 7 to 8 days.
We sought opinions from 2 different paedeatricians and their takes were similar. if you are worried, seek the advice of a doctor, and ask for a prescription for a depository (a small little pill inserted to the anus to help with defeacating).
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