Newborn not pooping since the last suppository, is it normal?

Dear Mummy Daddies, My newborn (2 months 20 days) has not been pooping for 6 days already. This is already her 3rd cycle (each cycle=7 days) and each cycle we had to give her lax suppository from the doc. Is there any reason or do we need to change milk powder? (We are giving her 60% breast milk / 40 for. Milk. ) #firstbaby #pleasehelp