A postpartum client who plans on formula-feeding her newborn asks, "When should my period return?" Which response by the nurse would be most appropriate?

"It's difficult to say but it will probably return in about 2 to 3 weeks.”.

"You won't have to worry about it returning for at least 6 months.”.

"It varies, but you can estimate it returning in about 7 to 9 weeks.”.

"You don't have to worry about that now.It'll be quite a while.”. — . . .