Most toddlers poop everyday or every 2 to 3 days but sometimes a toddler can go up to a week or even a month without pooping which is very normal.
It all depends on what the toddler had to eat and whether they ate more foods with fiber or drank drinks such as apple juice, etc.
The more fiber in the toddlers diet the more often they poop and the less fiber in the toddlers diet the less often they poop.
If your toddler is pooping once per week and pooping every week then it's likely normal and nothing to worry about but if your toddler has suddenly started only pooping once per week but was pooping more often before then I would advise taking the toddler to the doctor just to be sure nothing is wrong.
But there's no set amount of times that a toddler poops because every toddler is different.
If the toddler goes more than a few weeks without pooping then they're likely constipated but if they're pooping once per week then that could be normal.