The Barbie Nap 'N Play Nursery Playset was released in 2001. It is for ages 3+ and the product code is 88814.
Description[]
"You'll love helping Barbie® doll nurture and play with little sister Krissy™ doll in this adorable playroom. With cute toys, a play pen, a baby gym, and a swing that really works, you'll have hours of babysitting fun! (Dolls not included.)"[1]