After too many chocolate blimpies and not enough sleep, little Felix isn’t feeling well. Mama tries chamomile tea, sugared prunes (“You’ll feel perkier with the prunes”) and fresh air before deciding a trip to Dr. Duck is in order. Felix is a little afraid that Mama won’t stay with him at the doctor’s office, but she does. Dr. Duck listens to Felix’s heart, looks in his ears, and takes his temperature. Two spoonfuls of doctor-dispensed Happy Tummy and a long nap later, this forlorn young guinea pig is his energetic self again in Rosemary Wells’s reassuring, gently humorous story illustrated in watercolor, ink, and other media. (Ages 2–5)