3 months baby constipation need to seek medical attention to clarify the cause of the disease, can be divided into functional constipation, organic constipation, commonly used treatment methods include general treatment, drug treatment and surgical treatment. 1. General treatment: you can gently massage the baby’s abdomen to stimulate the baby’s intestinal movement, you can also use a warm towel to massage the anus to stimulate the anus to facilitate defecation, you can also drink a moderate amount of water, can relieve functional constipation. 2. medication: congenital hypothyroidism can cause the body’s metabolism to slow down, intestinal peristalsis will also slow down, can cause functional constipation. Thyroid preparations such as thyroid tablets and L-thyroxine sodium can be taken under doctor’s guidance. 3. Surgery: Congenital megacolon causes intestinal spasm leading to organic constipation, which can be treated surgically under doctor’s guidance. It is recommended that 3-month-old baby constipation in the adjustment of lifestyle after no avail, should go to the regular hospital in a timely manner, to identify the cause of the disease, and under the guidance of the doctor line standardized treatment, so as not to delay the condition. The above medications should be used in accordance with medical advice.