If your 7-month-old daughter is having small, ball-like stools, it could be a sign of constipation. It is surprising that the doctor recommended fruit juice as it is high in sugar, which is generally avoided at such a young age. Prunes and blueberries are usually good choices for treating constipation. Make sure she is also drinking enough fluids, and offering her water in between feedings may help soften her stools. If these suggestions do not work, it is best to consult a pharmacist or doctor for further advice.