Hello Jen,
We're sorry to hear you've experienced leaks. The Newborn Wizard UNO is designed to contain even frequent newborn wettings when the fit is adjusted correctly, so leaking is not something we'd expect under normal use.
A few things that can help are ensuring the diaper is snug around the legs, checking that all absorbent material is fully tucked inside the cover, and confirming that the rise and waist settings are appropriate for your baby's size.
If you'd be willing to reach out to our customer service team, we'd be happy to help troubleshoot the fit and make sure you're getting the best performance from your diapering system.