not necessarily but you can certainly call your doctor for patient-specific advice. breast fed babies (i don't know what you are doing) can go many days without a bowel movement. there is not much fiber in breast milk. formula may be no different. a baby can go 8 times a day or once every 8 days. it does not mean they are constipated. seasoned parents usually find this out; new parents (you? ) may not have this experience. constipation is hard dry stools and it is very unlikely that this is what is going on. you are concerned so just call your doctor for some advice.
5 week old baby hasn't had poopy daiper in almost 3 days should i take her to the docotors?