My husband puts our toddler in a clean pair of pajamas every night, and I let him wear the same pair for 2-3 days. I feel like since he only wears them at nighttime, and he doesn't sweat or get dirty, then he can wear them again. Plus, I don't have that many pajama sets in each size, and I don't want to do laundry every 2 days just because he ran out of pajamas. So, I'm curious to hear what's normal in your house.