I never worried at all in Southern California until a Collings OM started buzzing (not fret buzz) and was quickly diagnosed as being under humidified. Four to six weeks with sound hole humidifier (simple sponge in plastic) and it restored to normal. But lesson learned. Now I am less cavalier, but never obsessive. The guitars go back in cases at night with sound hole humidifiers. I fill them sort of every other night--though forget often enough. I check periodically with, probably, a fairly inaccurate--but probably accurate enough--in case hygrometer. If I go out of town I just fill the humidifiers the night before I leave and throw the guitars in cases in closets.
I'm not going to try to control either the house or room humidity. The sound hole humidifiers seem to work well enough.
Were I you, I'd put a sound hole humidifier in that Collings and put the baby to bed at night in its case.
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