Please choose the correct ending to complete the given sentence: Health: [header] How to handle milk allergy or intolerance in infants [title] Discuss your baby's issues with their doctor. [step] If you think your baby has a milk allergy or intolerance, you should first talk to their doctor. Your child's doctor can confirm whether this is what is making your baby sick.

Ending1: [substeps] In addition to letting the doctor determine if it is an intolerance, your doctor can also run blood tests on your child's milk to check for a bacterial cause of intolerance. [title] Check your child's stool for change. Ending2: [substeps] Generally, milk allergies are more prevalent when your baby is still at a developmental stage, such as five or eight weeks old. Take your child to the doctor if necessary. Ending3: They can get you the best advice, and share their opinion or diagnosis with you, even if it is not something you have already heard about. [substeps] Try to schedule regular appointments with your doctor so you can talk about your baby's health. Ending4: They can also recommend the best way to go about changing your baby's diet and possibly tell you which formulas are best for your baby. [substeps] Be prepared to discuss your baby's diet and symptoms with your doctor.

Answer format: ending1/ending2/ending3/ending4