At the end of the fourth season, Becky finds out that she is pregnant, and in this episode, in the middle of the fifth season, she has twin boys, on Michelle's fifth birthday. It is revealed later in the season that Michelle's birthday is in November. However, Becky finds out she is pregnant during the summer (presumably around June, after D.J., Stephanie and Michelle all finish their school year). However, it is revealed that she has been having cravings for the past few days. Cravings typically don't show up until the second or third month of pregnancy, and it is usually the fourth month before a woman begins to show that she is pregnant.