Please choose the correct ending to complete the given sentence: Health: [header] How to give your baby probiotics [title] Consult a pediatrician. [step] Before picking probiotics and giving them to your baby, you should consult a pediatrician. This is important, as every child has a unique medical background that only medical professionals are equipped to assess.

Ending1: A doctor can assess your baby's needs and provide an extra dose of probiotics. [substeps] Your pediatrician can help to start by explaining your baby's nutritional needs and the side effects of probiotics. Ending2: A pediatrician will have knowledge about the various food and drug allergies your baby may have as well as a better understanding of the hormones in their diet and mood. They can help you ensure that your child has even the smallest meal and is consuming enough nutrients. Ending3: [substeps] Your pediatrician may advise you not to give probiotics to a child who is seriously ill or has a compromised immune system. You will learn that babies as young as a few days old may benefit from probiotics. Ending4: Besides, even a pediatrician won't know what a baby's history actually is and how healthy it is. [substeps] Consider signing up for a doctor's check up, which allows a pediatrician to test for diseases as well as interview your child.

Answer format: ending1/ending2/ending3/ending4