The social benefits of working in an office are less tangible than money, but every bit as important. Is work a big part of your identity? How is your support network outside the office? Do you have other friends who are home with kids? Are you comfortable with "getting out there" and meeting people?
Life as a stay-at-home-mom is rewarding in a thousand different ways, but it can seem lonely to someone who is accustomed to having constant access to social interaction. Be sure to seek out friends to help you and your little one fill your daytime hours!