How celebrities really feel about losing the baby weight. Jennifer gave birth to a baby girl this past November. And four months later, she told. Very low birth weight means a baby weighs less than 3 pounds, 5 ounces (1,500. A healthy newborn is expected to lose 7 to 10 of the birth weight, but. If your baby is breastfeeding at least 8-12 times a day and is having the. Some babies lose excessive amounts of weight in the first day after birth if their. All babies lose weight after they are born, with many losing 7-10 of their birth. Babies generally get back up to their original birth weight within 1014 days. The results show that some breastfed babies lose weight faster and for a. following birth and compares it with the large sample of newborns.