If you plan to change it once a week, get 2-3 and if you plan to change it every day, get 5-7 crib sheets.
Dust, hair, and dead skin cells gather and accumulate on your baby’s sheets over time and consequently, the sheets would attract bacteria and pests that would adversely impact their health. So, your baby's sheets need to be washed at least every three days, which is twice a week.
It’s safe when the sheet is properly tucked in a firm crib mattress without any other soft objects in the crib. Fitted crib sheets are a safer choice as it has an elastic rim which keeps the mattress
It is advisable to use organic cotton baby crib sheets as it is more breathable and comfortable.