It's been seven months since we became a family of four, though we still appear to be a family of three because our baby won't be born for another two months. However, when you experience extreme, extended morning sickness, the baby makes his or her arrival sometime between week 4 and week 7 of pregnancy rather than after 9 months. This means that, for my only child, things began to change almost immediately after she heard the news that she was a big sister.