babies can go a very long time without a poop (the longest in my circle of friends was i think almost 2- 3 weeks and the midwives reassured her it was fine) the key distinction is not TIME between poops but whether the lo is in distress / TRYING to poop. if they are bearing down / trying to poop and either no success or obvious trouble and/or produce hard stone-like poops then you are dealing with constipation. if baby is happy enough then it is normal - all babies poop to their own schedule
if it is since the introduction of any particular solids just keep in mind that some are constipating and might need you to compensate with extra fluids and/or foods that counter them. constipating foods are often remembered with the term BRAT - bananas, rice, apples and toast/breads and the ones to counter it are the Ps - pears, prunes,and i am not sure of the others: peaches and plums
it could be the rice cereal if you have started with that as many babies find that hard to handle - you could mix in pears wth it and some breastmilk or formula for extra fluids. HTH
