Diaper change already?!

**Update** If anyone is curious, we switched to 4s and it's going famously! No leaking and fits much better πŸ‘πŸ»πŸ‘πŸ»
Hey ladies! Are any of the chunkier babies in size 4 diapers yet?
My little fella ("little" haha) is 20 lbs and 5.25 months. He has peed out of his diaper overnight twice this week. The pampers box says that 3s should go up to 28 lbs and that the 4s start at 22lbs but could these numbers be off?? Who has made the switch?Β 
And as always, a pic for cuteness!Β