Final answer:
A healthy baby typically needs around 578 calories per day, which aligns closely with choice d) 500-600 calories per day for the maintenance of an infant's weight in the first 4 months of life.
Step-by-step explanation:
Infants require a certain number of calories each day for weight maintenance and growth. According to a guideline, a healthy baby may require around 578 calories per day (calculated as 850 ml of milk daily at an energy value of 68 Kcal/100 ml of milk).
This suggests that infants during their first 4 months of life should consume closer to option d) 500-600 calories per day to maintain their weight. The specific value within this range can vary based on individual factors such as the baby's activity level, growth rate, and health status.