What should be done if a premature baby has constipation?

Patient's question:

Abdominal distension for one day, test and examination results: normal. Past treatment history and effectiveness: oral probiotics. The help you want: none

Doctor's answer:

Infant constipation can be resolved through painless methods.
(1) Gently massage the baby's abdomen with the palm of your hand, focusing on the navel, and rotate from left to right 10 times. Rest for 5 minutes, then massage 10 more times. Repeat 3 times.
(2) Lay the baby on their back and hold their legs to perform flexion and extension exercises. Stretch and bend once, repeat 10 times. Then, bend and stretch one leg 10 times.
(3) Apply an oily topical medication (such as tetracycline ointment) to the baby's anus. Use soft paper to pad it and gently push the anus, slowly applying 10 times. Generally, defecation occurs quickly.