Why is my baby peeing outside of his diaper?

Why is my baby peeing outside of his diaper?

My baby weighs 8 pounds and I have him wearing a size 1 diaper, but he keeps peeing outside of it. Is there a way to fix this issue? I checked the leg cuffs and they are loose on him; you can fit 3 fingers and understand he's in the beginning of the size 1. Will it get better once he gains more weight?

Why is my baby peeing outside of his diaper?
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