How much should a baby weigh at 4 months?

well, it is known that at birth most babies weigh 6 to 7 pounds on average. when first starting out babies do not eat that much for their stomachs are not that big. I'm not sure the accurate weight, but a pound a month from birth seems feasible. I would say 4 months they should weigh at LEAST 10 pounds. but this is just a generalized estimation going by average weight of a newborn.