My little darling hvnt poo for the 4th day... Any remedies or better see a doc? Worried Dad...

how old is your baby? my son didn't poo for about a week when he was about more than a month old. he was mostly breastfed so I was wondering why he didn't poo. but eventually when we saw a doctor, the doctor says it's normal but told us we can insert a small amount of suppository if we were concerned.