I got Blaise, the orphaned stableboy in Solitude (Katla's Farm) and Sofie, the orphaned flower girl in Windhelm. I wasn't going to adopt kids so quickly but I stumbled across Blaise on my way down from Solitude to the Solitude Sawmill to buy lumber. The dialogue to adopt him came up. His story was pretty sad and he wasn't annoying, so I adopted him. Stumbled across Sofie next in Windhlem when I was there to buy other supplies. How could I leave that poor girl to sell flowers for food in the snow? Now I feel bad for all the orphans in Riften I can't adopt.
I like Blaise and Sofie but I wish they would interact with each other and I wish I could adopt more kids.
Also, Blaise said he wanted a toy sword and that I could get one from the Khajiit caravans. Haven't found one yet, in the caravans or the hold shops. All I can find are dolls which they won't let you give to a male child. Apparently toys in Skyrims are gender-specific--annoying since Skyrim has otherwise been really good about avoiding stupid gender binary crap like that. Seriously, how is Sofie going to learn to be a dragon-killing badass like her adopted mom if I can't give her toy weapons to practice with???