First, thanks for sharing. And it's a lovely photo. As Darrel pointed out, this will be a treasured family photo.
Second, here's the single most important piece of information for shooting infants and boudoir work: soft light is your friend. If you use an artificial light (popup flash, speed light, strobe, light in the room from an artificial source) then get a modifier in front of it or bounce it off a white wall or ceiling. If you've got a window, unless it's a gray overcast day, put a scrim in front of it. It softens skin, hides pores/scars/imperfections, and makes everyone 20% more beautiful than they appear.
JoeW makes a really good point about modifying window light--especially for color photography, and especially for color photography of delicate, feminine subject matter, like a new baby girl!!! But one thing to keep in mind--if you are going to convert a shot made with that type of window lighting to Black & White, that little extra bit of crispness to the light as it comes in, unmodified by a scrim or umbrella, can work pretty well.
One thing about window light too is that the closer you get to the window, the faster the inside-the-room side falls off in intensity. If you shoot reallly close to the window, one side of the face will be bright, and the other side of the face will be in VERY dark shadow; as the distance from the window is increased, the light's degree of fall-off levels out, and the light side of the shot, and the darker side of the shot, become very close in exposure
once you are well toward the center of the room.
So...keep in mind, window light behaves like other light sources do. So, as Joe was saying, soft light is your friend, yes, and especially so in color. One way to get "softer" light is to move a little bit farther toward the center of the room, so the light is softer in the sense of a more-gentle highlight-to-shadow transition.
On this baby shot, in color, I would be tempted to brighten it a bit, and lower the clarity into the Negative 5 to 8 range, to soften the light a tiny bit. If I converted it to B&W, I think it'd be about right as-is. And I DO think you have the right idea in regard to waiting a while before making the final edits! That almost always works out best for me.