Pinky and Rex and the New Baby

Determined to be a good big sister, Rex starts spending all her time with the baby her family has adopted, making her neighbor Pinky fear that he has lost her friendship.
Rex's parents are adopting a baby, and Rex doesn't like the idea at all. Suppose her parents are so busy with the new baby they forget about her?
So she comes up with a plan. If she can be the perfect big sister, her parents will have to pay attention to her. The trouble is, being the perfect big sister is a lot of work, and it doesn't leave time for much else -- like her best friend, Pinky.