hey, my baby is fully breastfed as well.. doctor said it's ok to not poop even up to 10 days because breastmilk is very easily digestible, can fully absorb into the body, and hence no poop!! also, they told me its not recommended to swap to formula if you have enough breastmilk because breastmilk contains some sort of good bacterial for the gut, so if consuming formula, it kinda destroys it?? well this is what the doctor told me..