In that same vein I've known many a new father has very similar difficulties that would likely be a factor in worrying about the investment. I think it's largely a cultural issue that men don't usually take the same amount of leave (either at the same time or later to help deal with the new born). That said if I was investing and the founder was alone and planning on starting a family soon would probably turn me off unless they had a co-founder that I felt could take over during that time.