A baby even formula fed may not poop everyday so there's really no schedule as to when the baby should poop.
Babies tend to poop more during the first few months of there lives but after age 2 to 3 months of age the baby can sometimes go a full week without needing to poop at all.
If your baby hasn't pooped in over a week then you might need to see the doctor since your baby is likely constipated.