How long can a baby go without pooping?

Mga mommies! Need your suggestion po. My baby is turning 11 months on Thursday and 11 days na din sya di nagpupupu. I'm kinda worried lang po kasi this is her first time na ganon katagal di mag poop. Last time 9 days bago sya mag poop. Should I consult a pedia na po ba? By the way, she is a breastfed baby. Eating solids pero konti lang sya kumain. Thank you in advance po sa mga sasagot.