I don't think little boys get nearly the amount of wear out of their clothes that little girls can. Especially little, little girls. Baby A is 15 months old and just now starting to outgrow her 12 month clothes. She's just little. Part of the problem with that is people buy clothes for her age at the time and the weather at the time, i.e. summer dresses in a 9 month size because she was 9 months at the time. It was huge on her and given the crawling status at that point, she would have been crawling through the dress more than I was willing to deal with. However, with little girls, six months past the 'age' of the dress you can just toss a pair of leggings and a long sleeve onzie underneath it and now it's a wearable tunic. Slightly floral for December, but, it's clean and looks adorable.
This comes up because today is Christmas picture day at daycare with Mama T. I have a long dress that my mom got Baby A for church on Christmas, but I didn't want to send her to daycare in it to play all day, or make Mama T dress and undress her just for the picture. So, white long sleeve onzie, white leggings and a 3-6 month Christmas dress that I bought her last year for church, now works as a ruffled top. Done! Festive and just change the top for playtime later. Little boys just don't have that option. It fits or it doesn't and when it's outgrown, it's outgrown.
While I have absolutely no preferences on whether baby #2 is a second little girl, or a little boy, I do have an amazing array of little girl clothes that would make it awfully convenient to dress another little girl. Especially when both kids can wear the same clothes, one as a dress, and one as a top.