I read the article and saw the pictures about the little Prince and his playdate. The first thing that popped into my head was the different interaction between Kate and her child and Kim and her child. It was like night and day. I know exactly what you're talking about merylinkid.
You can see the love jumping out at you when you see pictures of Kate and her baby. When I see pictures of Kim and her baby, I do not see love. I'm not saying Kim don't love her child, I 'm saying I don't see love between the two.
Prince George has on regular clothes and they are cute. No onesies in sight. He's crawling, he's playing with other little toddlers, crying, laughing and having a ball. The picture of him pulling on Kate's hair......priceless.
Prince George was born in July of 2013 and Kim's child was born in June of 2013...... judging from the pictures I have seen of both, Prince George seems like he is more advanced than Kim's child and he's a month younger than Nori.
Maybe boys mature faster or maybe it's because Kim never show pictures of her child unless they are staged, but IMO, Prince George seems like he is more active.