I thought I knew everything there was to know about babies. I got good grades in medical school, and passed the exams to become a member of the American Academy of Pediatrics. We were taught that parents should make an effort to help the baby sleep through the night. If a baby needs eight ounces of milk in the middle of the night, the baby will not let you cheat him with six. Early feeding of solids makes no difference, and might make things worse.
Babies sleep through the night when they are ready to sleep through the night.
Giving the baby solid foods in the first few months when the gut is unable to digest anything more than human milk often allows a food sensitivity to develop which the baby may never outgrow. They grow fast. If they continue to grow as they do in those first few weeks, they will be 22 feet tall at age 10 years. Feed when hungry. Breast milk is low in fat and protein so is low in substainability.