move up to size 2 diaper?

Jenna
How do you know when to move up a size in diapers? My lo is 9 weeks and 2 days. Weighs a little over 12lbs. And the size one kinda seems like it's starting to get tight and last night he leaked thru his diaper twice. They still seem to fit but I wasn't sure if the leaking was a sign? Wanted to get everyone else's opinion. I still have one whole box of 252 size 1 diapers :( such a bummer! 

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