International Board of Certified Lactation Consultant (IBCLC) Practice Exam

The average weight gain for infants aged 5 days to 4 months typically falls within the range of 5-7 ounces per week. This period of rapid growth is characterized by significant increases in weight as babies transition from the early days of life, when they may lose some weight postnatally, to gaining weight consistently.

During this age span, infants are developing their feeding skills, and their nutritional needs increase as they start to consume larger quantities of breast milk or formula. The expected weight gain reflects the caloric intake required to support their growth and developmental milestones.

Health care providers consider this weight gain range as an important benchmark in assessing the health and well-being of infant feeding practices, as consistent weight gain is indicative of adequate nutrition. In sum, 5-7 ounces per week is the standard expectation for healthy babies during this growth phase, making it a key measurement for breastfeeding and formula feeding efficacy.