My bb was 3.4kg at birth. And 2 days ago, at week 7, went to polyclinic and she was weighing 3.1kg. It's a weight drop. Should I be worried? Or supplement bb ? The nurse says it's OK and her weight will gradually increase.

No. Don't worry Babies will lose weight at first. Babies are born with some extra fluid, so it is perfectly normal for a newborn to drop a few ounces when that fluid is lost in the first few days of life. A healthy newborn is expected to lose 7% to 10% of the birth weight, but should regain that weight within the first 2 weeks or so after birth. During their first month, most newborns gain weight at a rate of about 1 ounce (30 grams) per day. They generally grow in height about 1 to 1½ inches (2.54 to 3.81 centimeters) during the first month. Many newborns go through a period of rapid growth when they are 7 to 10 days old and again at 3 and 6 weeks. Should I Be Concerned? Newborns are so small, and it can be hard to know if your baby is gaining weight the way he or she should. You may worry that your baby has lost too much weight in the first few days or isn't taking enough breast milk or formula. If so, talk to your doctor, who may ask you about: How many feedings a day your baby gets. A breastfed baby may feed about 8 or more times in a 24-hour period; formula-fed babies usually eat less often, perhaps every 3 to 4 hours. Breastfeeding moms may benefit from meeting with a lactation (breastfeeding) counselor, who can make suggestions to increase comfort and improve technique. How much your baby eats at each feeding. A baby generally nurses for at least 10 minutes, should be heard to swallow, and should seem satisfied when done. At this age, formula-fed babies may drink up to 3 to 4 ounces (90 to 120 milliliters) at a time. How often your baby urinates. A breastfed baby may have only 1 or 2 wet diapers a day until the mother's milk comes in. Expect about 6 wet diapers by 3 to 5 days of age for all babies. After that, babies should have at least 6 to 8 wet diapers a day. How many bowel movements your baby has each day, and their volume and consistency. Newborns may have just one poopy diaper a day at first. Poop is dark and tarry the first few days, then becomes soft or loose and greenish-yellow by about 3 to 4 days. Newborns usually have several poopy diapers a day if breastfed and fewer if formula-fed. It is expected that all newborns will lose some weight in the first 5-7 days of life. A 5% weight loss is considered normal for a formula fed newborn. A 7%-10% loss is considered normal for the breastfed baby. Most babies should be back at birth weight by days 10-14 of life.