I mentioned DS's stats below, but he is 25 lbs 3 oz & 34 in.
His jeans are 24m w/ adjustable waist. My favorite pair he currently has are BRU brand. He has 2 pairs of fleece 18 month pants that fit him perfectly - I think one is Children's Place & the other is Carters. He has one pair of cargo Carters 18 month w/ elastic waist that also fit him perfectly. I got him a pair of wind breaker type pants from Target that are 24 month & I have to roll them at the waist.