Quick answer

Choose the Newborn size (4-10 lbs) for tiny newborns and early weeks; switch to the X-Small size (6-12 lbs) for a longer fit window that works from the late newborn stage through early infancy.

Why sizing matters for hook & loop covers

Hook and loop closures offer easy adjustments, but the overall cover size still determines how well it contains leaks and prevents leg gap. A cover that is too large can gap around the thighs, while one too small may leave red marks or not fully cover the diaper.

Decision rules for choosing your size

  • Baby weighs 4-6 lbs: Start with the Newborn size. The 4-10 lb range provides a secure fit for tiny babies, especially preemies or early-term newborns.
  • Baby weighs 6-10 lbs: Either size can work. The Newborn will fit snugly now, but the X-Small will last longer as your baby grows. If you want fewer covers, choose X-Small. Consider buying one of each to test the fit on your baby's body shape.
  • Baby weighs 10-12 lbs: Go with the X-Small size. The Newborn is likely too small, and the X-Small will still fit well through this range. At the top of the X-Small range, watch for tightness around the thighs and move to the next size up when needed.

Product facts

Which size should you choose?

Best for

  • Newborn size: tiny newborns, preemies, and babies under 6 lbs who need a precise fit
  • X-Small size: babies 6-12 lbs who want a cover that lasts through the early growth spurt

Not for

  • Newborn size: babies over 10 lbs or those with chunky thighs who need extra room
  • X-Small size: babies under 6 lbs who may experience gaping at the legs