If your 7-month-old baby is constipated, there are a few things you can try to help relieve the problem. You can give your baby prune, pear, or apple juice (without added sugar), prune puree, more fruits and vegetables, more whole grain foods (such as barley cereal), and ensure they are getting enough water. If these methods do not improve the situation after about 5 days, and if your baby seems uncomfortable, you may consider using a glycerin suppository, which can be purchased at a pharmacy. It is important to not use laxatives regularly and only for short periods. If constipation persists for more than 2 weeks, or if there are other concerning symptoms like fever, vomiting, blood in the stool, or lack of weight gain, it is recommended to consult a doctor for further evaluation.